Christmas lights switch-on risk assessment: a practical guide

A lights switch-on packs the largest crowd of the year into a town centre, in the dark, in the cold, often with a road closure and a stage. It is usually a town's highest-risk event and frequently its least-resourced — run by a chamber of trade or a town council on goodwill.

Crowd density is the main event

Everything else is secondary. A switch-on concentrates a large crowd into a small hard-surfaced area, at a known moment, facing one direction. That is the classic set of conditions for a crush, and it deserves genuine analysis rather than a line saying 'stewards will monitor crowds'.

Work out your realistic peak attendance, the usable area once you remove stage, barriers and street furniture, and the resulting density. Plan entry and exit routes that don't cross, keep emergency access lanes clear and enforced, and decide in advance what you do if the space fills — including how you'd hold or divert arrivals. The Event Safety Guide (HSG195, the 'Purple Guide' successor material) and the Guide to Safety at Sports Grounds are the reference points for density figures.

Darkness changes everything

• Lighting. Existing street lighting is designed for a normal evening, not for a crowd. Light your exits, your steps and level changes, your first aid point and your stewards. Test it after dark on a rehearsal night, not on paper.
• Trip hazards you can't see. Kerbs, bollards, planters, cables, guy ropes. Anything you can't remove, light or mark.
• Lost children. Far harder in the dark and in a dense crowd. A well-lit, well-signed reunification point, wristbands offered on entry, and a procedure the stewards actually know.
• Stewards need to be visible. High-visibility clothing, torches, and a communications system that works in a crowd — radios, not phones, because the mobile network will struggle.

Stage, power, road closures and the weather

Stage and structures: get the supplier's structural documentation and wind loading, and a documented trigger for taking down or not using it. November weather is the reason this matters.

Power: generators and temporary distribution need a competent electrician, RCD protection, cable routes that don't cross pedestrian flows, and an inspection certificate. Wet weather and temporary power is a combination to take seriously.

Road closures: apply early — a Temporary Traffic Regulation Order can take months. Physical closure points need to be staffed and robust; a cone is not a closure. Consider deliberate hostile-vehicle mitigation at the closure points, which is now common practice for town centre events and something the police will likely raise. Our traffic management guide covers the detail.

Cold: stewards standing still for four hours in November get cold, slow and less alert. Rotate them, feed them, and get them somewhere warm. This is a safety control, not a perk.

Martyn's Law and the counter-terrorism picture

Switch-ons are exactly the kind of crowded, publicly accessible, predictable-in-advance event that counter-terrorism planning is aimed at. Even before the Terrorism (Protection of Premises) Act 2025 duties commence, the police will expect you to have thought about it, and many councils already ask.

If your event is a qualifying event with 800 or more people expected and controlled access, enhanced-tier duties may eventually apply — see our enhanced tier guide. Most switch-ons are open-access and won't meet the 'qualifying event' access-control test, but the underlying public protection procedures — evacuation, invacuation, lockdown, communication — are worth writing regardless, because the SAG will ask.

Common questions

How many stewards do we need?

There is no formula that survives contact with a real site. The honest method is to work from tasks and positions: every closure point, every barrier line, every exit, the stage front, the reunification point, plus a roving reserve and supervisors. Count the positions, add shift cover, and that's your number. Ratios quoted online (often around 1:100) are a sanity check, not an answer — a dense town-centre crowd in the dark needs more than an open field in daylight.

Do we need a road closure order?

If you're closing a public highway, yes — a Temporary Traffic Regulation Order or, for some events, an order under the Town Police Clauses Act. Lead times are long, often two to three months and sometimes more, and there may be advertising requirements and a fee. Contact the highway authority as soon as you have a date. Closing a road without authority is an offence and will invalidate your insurance.

What about the crowd if it starts to feel too full?

Decide this in advance, on paper, with named people. Agree the observable triggers — a defined area reaching capacity, movement becoming involuntary, queues backing into a road — and the response: hold arrivals at defined points, open additional exit routes, stop the stage programme, make a public announcement. The single most useful thing is having someone with an overview position and the authority to act on it without asking permission.

Is a switch-on covered by Martyn's Law?

It depends on the numbers and, crucially, on access control. The 'qualifying event' route in the Act generally requires 800 or more people and measures controlling access — tickets, passes, or express permission. A freely open town-centre switch-on typically won't meet that test, though a ticketed or fenced one might, and any qualifying premises used as part of it may be caught separately. Duties also hadn't commenced at the time of writing, so check gov.uk and ProtectUK for the current position rather than relying on this summary.