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Zones, objects & the Stage builder

An event site is drawn as zones (the arena, the campsite, the car parks, the compounds), objects from the event library (stages, tents, toilets, bars, gates, bins — 38 of them in seven categories), barrier runs and trackway. Each zone with a published density shows its capacity on its label; each object knows what it provides, when it is on site and what it costs to hire.

Zones with their capacity labels and a selected stage inside the arena; toilets, hand-wash and a medical post in the welfare compound.
Zones with their capacity labels and a selected stage inside the arena; toilets, hand-wash and a medical post in the welfare compound.

Drawing zones

Pick a kind from the 🎪 Zone… picker (or 🎪 Event ▸ Draw zone…), then click the plan to lay the corners; close the site boundary first. A zone's label shows its area and, where the kind has a published density, its capacity — "1,234 persons @ 0.3 m²/p" — or says "no published density".

ZoneCapacityOn site by default
ArenaStanding audience, 0.3 m² a person (gov.uk open-air guide Table 3 — Checked)Live
CampsiteCamping, 6 m² a camper (gov.uk open-air guide Table 3 — Checked)Live
Production / backstagenone publishedBuild · Live · Derig
Welfarenone publishedBuild · Live · Derig
Bars & tradersnone published — no UK ratio per attendee existsLive
Entrynone published; its area is judged against the queue's holding areaLive
Safer areaNot a crowd zone. Where people go to invacuate (Martyn's Law). It counts only when drawn inside an existing building on the site or on a hard-sided structure such as a site cabin, a container or the ticket kiosk — never a tent, marquee or open ground, and never the control room or the lost-children cabin. The check gives the most people who physically fit, at 0.3 m² a person (our ceiling, not a shelter standard). Safer areas are part of the security layout, so the shared outputs leave them out unless you tick them in; see Martyn's Law readinessLive
🅿 Car parkTemporary event parking by default: indicative spaces on open ground, laid out by the parking engine and kept off placed objects, with no aisles, surface or markings. Switch an area to a standard (built) car park from its edit bar. VIP bays can be marked—

The guide's other densities — assembly 0.5 m² and dining 1.0 m² a person — are in the model but no zone kind uses them yet, because a vendor compound sized at a standing density would be a wrong number with a confident badge. A grass car park is laid out with our own field defaults — 2.5 × 5.0 m bays, 6 m aisles, 90°, nothing built — and the 8 · Car Parking panel says so on an event site; see temporary event parking.

Lock a zone once it is right. Select it and click its padlock badge, or right-click ▸ 🔓 Lock. A locked zone cannot be moved, reshaped, deleted or changed to another kind. Its label and its Build · Live · Derig phases stay editable. See Locking objects in place.
The arena is never checked for more people than the event has. A 10 ha campsite is not 16,000 campers at a 5,000-person event: every crowd zone is capped at the attendance when its exits are judged, and the capacity line compares the arena's capacity to the attendance, not the other way round.

The library

🎪 Event ▸ 🚻 Place object… opens the content library on the event categories; click a card to place it, then drag it into position. Objects are recognisable kit — a 16-cubicle toilet trailer is 13 m long and shows sixteen doors — and the plan, the thumbnail and the 3D form all come from one model. Footprints are typical UK hire dimensions; no standard governs them, and they carry the Assumption badge.

CategoryObjects (parameters)
🎤 PerformanceStage (the Stage builder), FOH tower, Screen (width, height), Delay tower, LED screen trailer (small), LED screen trailer (large), LED video wall (freestanding), Outdoor projection screen, Power distribution box
⛺ StructuresMarquee (span 6–25 m, length, exits), Stretch tent (exits), Gazebo (exits)
🚻 WelfareToilet trailer (6, 10 or 16 cubicles), Portable toilet, Urinal bank (4 or 8 positions), Accessible toilet, Hand-wash unit (2, 4 or 6 basins), Drinking-water point, Water bowser, Shower block (4 or 8 showers)
🚑 Medical & safetyMedical post (width, depth), Welfare tent, Lost children, Control room, Lighting tower, Generator (20–500 kVA), Helicopter landing site (pad size, windsock), Fire point, Ambulance (UK), Ambulance (St John Ambulance livery), Police car
🍔 Bars & tradersBar (length), Food unit, Ice cream van, Hot dog stall, Burger van, German bratwurst hut, Merchandise unit, ATM, Vendor pitch; Burger, Coffee, Pizza and Vegan food trucks, Coffee, Taco and Gelato campers (retro), Retro diner trailer, Bakery van (retro), Sausage roll van, Crêpe van (corrugated), Crêpe & churros trailer, Wood-fired pizza trailer, Gelato cart, Waffle & dessert stall, BBQ gazebo stall, Bratwurst, Chestnut, Mulled wine and Craft huts (Christmas), Churros chalet (Christmas), Container bar, Mobile bar trailer, Inflatable beer bar and Inflatable festival pub (bar length), Merchandise stall, Market stall (gazebo)
🎟 Entry & movementEntry / search lanes (1–8 lanes), Turnstile bank (2–8), Ticket box, Gate (width, default 3.1 m), Removable bollard / HVM opening (width 1–8 m, default 3.1 m), Accessible viewing platform
♻️ Waste1100 L bin, Skip, Recycling station, Grey-water tank
🎡 EntertainmentRides: Junior big wheel, Big wheel, Giant wheel, Gallopers, Two-tier carousel, Juvenile roundabout, Elephant ride (flying elephants), Waltzer, Frog spin (jump-and-spin), Dodgems, Miami, Pirate ship, Swing boats, Booster, Claw, Drop tower, Bungee ball, Tower swing, Motion simulator, Caterpillar coaster, Ghost train, Fun house, Mirror maze, Helter skelter, Log flume. Inflatables and novelty: Inflatable slide, Trampolines (bungee), Mechanical bull, Inflatable obstacle course (giant balls), Inflatable sweeper game. Attractions: Climbing wall (mobile tower), Roller rink, Ice rink (real ice), Ice rink (synthetic), Silent disco. Stalls: Coconut shy, Basketball hoops, Hook-a-duck, Derby racers, Hoopla, Tin can alley, Shooting gallery, Darts, High striker (all with capacity parameters and an entrance side)
🪧 Signage & wayfindingFeather flag (food), A-frame sign, Fingerpost sign, Fence banner, Entrance banner
📹 Site securityCCTV tower, CCTV sentry (portable) — both in the security layout, so hidden from review links and other people's outputs like the control room. Each has a view angle, view range and view direction under ⚙ Parameters (a tower 360° to 50 m, a sentry 60° to 30 m), drawn as a camera view splay on a sketch view that has them ticked — security material, hidden wherever the camera is

Many of the original 3D objects count on an event site too — the porta-potty, the site generator, the bell tent, the Heras panel, every Temp Works item — under two more categories, 🏕 Camping & glamping and 🚧 Site & traffic; see Library groups and what counts on an event site.

Some event objects are fixed 3D models rather than parametric forms — the emergency vehicles, the signs and banners, the screen trailers, video wall, projection screen and power distribution box, most of the food trucks, vans, huts and bars, and the Quad bike, which an event site lists under 🚗 Entourage. Their size is the model's own and they have no parameters, only the Build · Live · Derig phases. The emergency vehicles are placed and scheduled, but they are not a medical post and are not priced: arrange cover with your provider. The LED screens are priced on the LED screen line, one per screen; the projection screen and the distribution box are not priced, and the distribution box does not count in the power check, which compares generator kVA with the ride and stall load. A food or drink model counts as one food unit, as the Food unit does; a bar model counts its bar length, which you can set to the counter you hire. The St John Ambulance model is named for its livery; it implies no endorsement by the charity.

Select an object and press ⚙ Parameters (or right-click ▸ ⚙ Parameters…) to set its parameters — cubicles, span, kVA — and the phases it is On site during (Build · Live · Derig, at least one). A multi-selection edits them together; a field that differs across the selection shows as mixed until you set it. What an object provides (a trailer's cubicles count as toilets, a lane set's lanes as entry lanes, a bank's positions as urinals) is what the provision checks count.

Entertainment: fairground rides and stalls

The 🎡 Entertainment category holds 44 objects: 25 fairground rides (wheels, roundabouts, flat and swing rides, thrill rides, and track and walk-through rides), five inflatable and novelty rides (an inflatable slide, bungee trampolines, a mechanical bull and two inflatable games), five attractions (a climbing wall, three rinks and a silent disco) and nine side stalls. Rides and stalls are built up and pulled down on the site, so they are on site in all three phases by default.

How some names are read. A few of the objects added on 21 Oct 2026 are known by trade or brand names, so the library names the type and draws nothing branded:

The footprint is the operating footprint. A ride's width × depth is everything it needs while it runs: the machine, the space it sweeps at full movement (a pirate ship's swing, a booster's arm, a Miami's travel), the public barrier line around it, and its entrance and exit steps. HSE's fairground guidance says barriers must keep the public outside a ride's safety envelope (HSG175, para 242), so the barrier line is part of the ride. HSG175 gives no fixed gap between rides: spacing comes from each ride's envelope, its barriers and waiting areas, and emergency access (para 182). The default sizes are typical travelling rides from manufacturers' and showmen's listings, Likely at best. The ride's own manual governs.

Capacity. Every ride and stall carries its capacity as parameters: Riders a cycle (for a stall, Players at once), Ride cycle (a stall's Game time) and Load and unload in minutes, Minimum height in cm (0 means none: a stall, a rink, the silent disco and the mirror maze have none, and none is invented for them), Operators and Power in kVA. Riders an hour is worked out from them, never typed in: riders × 60 ÷ (cycle + load and unload), rounded down. ⚙ Parameters shows it under the footprint, for example Footprint 15 × 13 m · 4.5 m high · 40 riders a cycle · ≈ 480 an hour · min 120 cm · 2 operators · 45 kVA; a rink says 27 skaters at once, the disco dancers, a walk-through visitors. When the selected objects differ, it says that instead. The defaults are typical figures; set the real ride's own.

Entrance and exit. Each ride has a modelled entrance (steps or a ramp, a pay box and queue rails) and a separate exit gate, at least 2 m apart on the edge of the footprint. On the plan they are marked with a chevron and the word IN (green) or OUT (red; black ink on a sketch sheet). The marks keep a constant size on screen and turn with the ride. Zoomed far out, where a ride's IN and OUT would overlap, the words are dropped and the chevrons show the direction; a ride too small to see on screen shows no marks. They are hidden on a sketch sheet that hides event objects, and the DXF records them on EVT_ENT. Entrance side sets where they go: Left puts the entrance on the left of the ride as the plan shows it with the front at the top, and Right mirrors the entrance and the exit to the other side.

Perimeter barrier. Each of the 35 rides with a public barrier round it (the rinks, the disco and the other attractions included) has a Perimeter barrier tick box under ⚙ Parameters, ticked by default. Untick it on a ride to leave its barrier out, for example where the ride stands inside your own crowd-barrier run or backs onto a building. Only the barrier goes: the entrance steps, pay box, queue rails and exit gate stay, and the footprint, the capacity and the IN and OUT marks do not change. In place of the barrier the plan shows the operating footprint as a dashed outline, so the space the ride needs stays on the drawing; the outline is not drawn in 3D. The caption and the Event objects schedule say no perimeter barrier. The public must still be kept outside the ride's safety envelope (HSG175, para 242), so whatever you draw instead has to do that job. When the selection mixes rides with and without the barrier, the box shows a dash and leaves each ride as it was unless you click it. One Ctrl+Z puts it back. Export to Revit sends each ride as drawn: one with its barrier unticked becomes its own family, named with (variant 1), (variant 2) and so on, without the barrier. A copy in an array takes its parameters from the array, so set it on the run instead. The side stalls have no tick box: their rope line is part of the stall.

Keep-clear markings. The Booster's arm sweeps overhead beyond its ground barrier, so the plan marks the sweep on the ground either side as a dashed keep-clear line (yellow in colour, ink on a sketch sheet). Like the barrier-off outline it is a drawing mark, not an object: it is dashed on the plan and on sketch sheets, the DXF records it on EVT_ENT with the DASHED linetype, and it is not drawn in the 3D view, white card, the library thumbnail or a realistic render.

Ride capacity schedule. A sketch sheet on an event site offers a Ride capacity schedule with these columns: marks (the marks of the rides on that row), ride, quantity, riders a cycle, cycle, riders an hour, minimum height, operators and kVA. Its foot totals riders an hour and kVA across every unit placed. It downloads as CSV like every other schedule. When the design has rides, the Event Safety Plan appendix prints the same table under Objects.

Hire at £0. A travelling showman's ride or stall usually pays the organiser a pitch rent or a share of the takings. It is not hired in. The rates for rides, inflatables and side stalls on the built-in card are therefore 0, like the vendor pitch. The budget says so rather than showing £0 — Entertainment: 3 rides or stalls, rate not set — a showman's ride usually pays you a pitch fee. Enter a figure on your rate card only if you are hiring a ride in, or tick keep at 0 there to confirm the 0. The rinks, the silent disco and the climbing wall are different: an organiser usually hires them in from a supplier, with their staff, so they are priced on their own built-in 0, Attraction, hired in, where you enter the supplier's quote. The budget says that for them: Entertainment: 1 hired-in attraction, rate not set — enter the supplier's quote.

Inspection before use. Each powered ride needs a current Declaration of Operational Compliance (DOC) before the public uses it. The DOC is issued by a registered inspection body and is valid for at most 12 months; the organiser checks it before the fair (HSG175, paras 74, 142 and 187). There is no legal obligation to use an inspector from any particular registration scheme (para 82): the schemes HSE recognises are ADIPS, the Amusement Device Inspection Procedures Scheme, BACTA's coin-operated regime within it, and PIPA, administered by MUTA, for play inflatables (para 83). Each play inflatable needs a numbered PIPA tag or an ADIPS Declaration of Compliance. HSE's inflatables guidance also says no inflatable should be used in winds above 24 mph (38 km/h), and some manufacturers set a lower limit. A stall needs no ride inspection (HSG175, Table 2); the organiser's risk assessment covers it. The tool does not check any of this. The appendix carries the reminder beside the ride table. What the checks do read about a ride — where it stands, where its entrance opens, its phases, its load, overhead lines and the licensed hours — is under Rides: what is checked and what is not.

Animated rides in 3D

In the 3D view of an event site the rides can run. The Animate rides button, a small ferris wheel in the top bar just after the White card tick box, starts and stops them. With it on, the rides set off one after another over the first few seconds, as at a real fair, and keep going while the 3D view is open. Each ride placed runs on its own clock, so two of the same ride never move in step. The button shows only in 3D on an event site that has at least one moving ride.

The footprint already holds the movement. Every moving part stays inside its ride's footprint and barrier line. The pirate ship's height is the top of its 70° swing, 17.35 m at the default 40 riders, not the machine's quoted height, so the rules and the report work with the space the ship really sweeps.

The Stage builder

A stage has its own configurator: 🎪 Event ▸ 🎛 Stage builder… opens it on the selected stage (with none selected it places one at the view centre first), the Stage card in the library carries a 🎛 badge that does the same, and ⚙ Parameters on a stage opens the builder instead of the inspector. A live plan and front-elevation preview redraws on every change.

The Stage builder: presets, parameters and the plan and elevation preview.
The Stage builder: presets, parameters and the plan and elevation preview.

Five presets set several parameters at once, named as the trade names them: Trailer stage 6 × 4, Mobile roofed 8 × 6, Mid stage 12 × 10, Festival main 20 × 16 and Arena end stage 24 × 18. They are typical UK hire sizes — ours, unverified — and every value stays editable. Apply writes the parameters as one undo step. Wings, thrust and overhang are inside the footprint the checks and the obstacle polygon use, and the hire schedule prices the deck, roof, wings and screens as separate lines.

The helicopter landing site

Under Medical & safety. A square pad of 20–60 m with an H, a marked circle, corner cones and an optional windsock. The default 30 m is twice the 14.64 m overall length of the AW169 air ambulance, rounded up to the next 5 m — the CAA's rule for private sites (Safety Sense Leaflet 17, Helicopter Airmanship, v2 — Checked); the operator's own site survey governs. The helipad check notes the CAA's 1,000-person assembly gate and warns when a structure or crowd zone sits within 10 m of the pad edge (our own clearance).

Barriers and trackway

Four barrier runs are drawn like any fence run — click points, double-click or Enter to finish — from the Fence-wall menu or the 🎪 menu:

Heras, pit and crowd barriers are panel runs, so they draw in whole panels and a run already drawn can be fitted with ▦ Fit or set to a panel count — see Fences, walls & panel runs. The HVM line is not a panel run and draws freely.

🛣 Trackway is a temporary roadway drawn like a road: 3.7 m wide — the fire-appliance access width in the gov.uk open-air guide — rated 12.5 t, no footway, flush with the ground. Select it to change its width; the Trackway width for a fire appliance check warns on anything narrower than 3.7 m. Trackway is measured and priced on its own, never as tarmac.

🧭 Vehicle route (indicative), also in Roads ▾, draws the track a fire appliance or service vehicle would take over ground that has no road or trackway — firm grass, an existing hardstanding, a farm yard. It is an indication, not a built element: nothing is laid, measured, hired or priced, it is not an obstacle and it never blocks a walking route. It draws as a dashed violet centreline with open diamonds and a faint corridor at its width (3.7 m by default, the gov.uk open-air guide's fire-appliance access width — select it to change it), as a translucent ribbon in 3D, and on its own DXF layer EVT_VEH_ROUTE. The emergency-route check drives it, joined to any road or trackway it meets (a small ring marks each join; an end drawn into a road's corridor snaps to its centreline), but never passes a route that uses it: the finding warns that the ground and width along it must be confirmed suitable for a 12.5 t appliance — our own rule; the 3.7 m and 12.5 t are the guide's figures. Where the route leaves or crosses a kerbed road it adds that a vehicle crossing (dropped kerb) is needed. A built route that reaches the zone cleanly is always used; otherwise the check may take the indicative route instead, and says so.

🚶 Pathway (indicative), also in Roads ▾, is the pedestrian twin of that route: a walking line, a security patrol route or staff circulation, drawn over ground where nothing is built. No surface is laid, nothing is measured, hired, priced or billed, no house or plot fronts it, it is not an obstacle and no array runs along it. It draws as a dotted teal line with small open circles, 1.8 m wide by default (0.9–6 m — select it to change it), as a flat indication ribbon in 3D with no slab and no shadow, and on its own DXF layer EVT_PATHWAY. It has its own sketch category, Pathways (indicative), so a sheet can leave it off.

Two things it deliberately does not do, both worth knowing before you draw one:

It also credits nothing on the walking side: it adds no exit, no exit capacity, no evacuation time and no travel distance, and it does not shorten any walking route. Walking in events mode is worked out from barriers and gates, not from drawn paths, so a pathway through a fence with no gate on it is still a fence with no gate.

A Gate is an object, not a run: drop it on a Heras line and the walking graph opens the fence there, the emergency route can pass, and a gate within 2 m of a crowd zone's edge is one of that zone's exits.

A Removable bollard / HVM opening is the opening in a vehicle security line: guidance para 8.20's example closes a service road with a removable bollard. Put one where an HVM line crosses the emergency route and the fire appliance can pass while the line stays closed to other vehicles. It is never a crowd exit, and it is part of the security layout. A plain Gate at the same crossing lets the appliance through too, but it is the gap a hostile vehicle uses, and the checks say so.

Privacy screen on a Heras run

Select a 🚧 Heras fence run (or a panel run of a hire company's Heras panel) and tick ▤ Privacy screen in the edit bar, or right-click the run and choose ▤ Privacy screen — add. It hangs a semi-transparent sheet (scrim, debris netting or shade cloth) on one face of that run. It is set per run, not per style, so you can screen the back-of-house line and leave the front clear.

Not modelled: printed branding, a screen on only part of the panel height, and what a screen does to stewards' sightlines into the screened area.

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