Event Safety at Outdoor Festivals: A UK Organiser’s Guide

By UK Event Managers • Safety & Risk • 11 min read

Outdoor festivals carry a safety risk profile that indoor venues simply cannot match. No building structure means no fire suppression system, no permanent exits, no engineered crowd barriers. The environment is uncontrolled — weather changes, ground conditions deteriorate, crowd densities in open fields are harder to manage than in a seated venue. When outdoor festival safety UK planning fails, the consequences can be catastrophic: the Roskilde disaster, the Astroworld tragedy, and closer to home, the incidents at unlicensed events that prompt coroner’s inquiries every summer in this country.

This guide covers the core safety obligations for UK outdoor festival organisers — from the legal framework and licensing requirements through to crowd management, temporary structures, weather planning, medical provision, and the new counter-terrorism duties under Martyn’s Law.

What Is Outdoor Festival Safety?

Outdoor festival safety is the body of planning, procedures, staffing, physical measures, and documentation that a UK event organiser must put in place to protect the health, safety, and welfare of everyone on site — attendees, performers, staff, contractors, and volunteers — during an outdoor event with amplified music or significant public assembly.

The primary legislative framework is the Health and Safety at Work etc. Act 1974, which imposes a general duty of care on anyone who creates risk for others. Complementing this are the Management of Health and Safety at Work Regulations 1999, the Licensing Act 2003 (which governs the authorisation of regulated entertainment and the sale of alcohol), and increasingly the Terrorism (Protection of Premises) Act 2025 (Martyn’s Law) for events with 100 or more expected attendees.

The industry reference documents are the Purple Guide (Health & Safety: advice for music and other events, published by the Events Industry Forum) and the HSE’s Event Safety Guide (known as the Yellow Card). These are not legislation but are considered best practice by courts, coroners, and local authority Safety Advisory Groups.

Who Does Outdoor Festival Safety Apply To?

Any organiser of an outdoor event with amplified music, public attendance, or both must address event safety. The legal duties apply regardless of whether you are a large commercial promoter, a community organisation, a charity, or an individual. The size of the event affects the scale of the measures required, not whether they are required at all.

Practically speaking, every outdoor festival that requires a Temporary Event Notice (TEN) or a premises licence to operate — which covers any event involving licensable activities such as amplified music or the sale of alcohol — must have a structured approach to safety as a condition of that authorisation. Local authorities routinely require an Event Management Plan (EMP) and engagement with the Safety Advisory Group (SAG) for events above approximately 500 people.

The Core Safety Domains for Outdoor Festivals

1. Crowd Management and Capacity

Crowd safety is the highest-consequence risk at most outdoor festivals. The Purple Guide remains the definitive reference for calculating safe capacities and managing crowd flow. Key requirements include:

• Calculating site capacity based on usable area and appropriate density figures (0.5 persons/m² as a comfortable standing baseline; lower in confined areas near stage fronts)
• Entry processing rate analysis — can your gates admit your audience quickly enough to avoid dangerous external queuing?
• Clearly defined crowd management zones with appropriate barrier configurations
• Trained stewarding at ratios appropriate to crowd risk (minimum 1 per 250 for general stewarding; higher at front-of-stage areas)
• A dedicated crowd monitoring capability — either CCTV or mobile steward reporting — so the control room has real-time situational awareness

For more detail, see our full guide to crowd management at events.

2. Temporary Structures

Stages, marquees, grandstands, lighting towers, and large freestanding structures must be designed, erected, and inspected by competent persons. The key requirements are:

• Structural design certificate: Any temporary structure that could injure people if it failed should have a design certificate from a structural engineer confirming it is fit for purpose at the intended site and loading.
• Build and strike inspection: A competent person (typically the structural contractor) should sign off the structure as correctly erected before it is used and supervise its dismantling.
• Wind loading: Outdoor structures must be designed for the wind conditions likely at the site. Many structure failures in the UK occur when wind exceeds what a structure was rated for. Obtain wind speed trigger points from your structural contractor — the speed at which you should begin de-rigging or evacuating the area.
• Ground conditions: Peg and anchor fixings for marquees and stages depend on adequate ground conditions. Wet or soft ground reduces holding strength significantly. Check ground conditions before and during the event.

3. Electrical Safety

Outdoor festivals rely extensively on temporary electrical installations — generators, distribution boards, stage power, lighting, catering. All temporary electrical work should be:

• Designed by a qualified electrical engineer
• Installed by a competent electrician
• Inspected and tested (an EICR certificate for temporary installations) before the event opens
• Protected against water ingress — IP-rated connections and covers for outdoor use
• Residual current device (RCD) protected throughout

Generator fuel — typically diesel — presents a separate fire and spill risk. Storage and refuelling must be managed away from the public, with appropriate secondary containment and fire extinguishers.

4. Medical Provision

Medical provision must be proportionate to the event’s risk profile. The Purple Guide provides a medical planning calculator that takes into account expected attendance, event duration, alcohol provision, crowd density, and type of music. Key minimum requirements for most outdoor festivals include:

• At least one dedicated first aid post with qualified personnel
• At minimum, one paramedic for events over 3,000 people
• Pre-notification to the local NHS Ambulance Service (essential — not optional)
• Defined ambulance access route to an agreed rendezvous point on site
• Documented major incident procedure

5. Fire Safety

Outdoor festivals present particular fire risks from generator fuel, temporary gas installations (catering), compressed gas cylinders (pyrotechnics, catering), and the combustibility of temporary structures and soft furnishings in marquees. Your fire safety approach should cover:

• Fire risk assessment specific to the site
• Adequate fire extinguisher provision and staff trained in their use
• No-smoking zones around fuel stores and compressed gas
• Fire evacuation plan and muster points
• Pre-event liaison with the local Fire and Rescue Service for events above 5,000 people

6. Weather Planning

Weather is the outdoor festival organiser’s most uncontrollable variable. A weather management plan must address:

• High winds: Trigger wind speeds for specific actions — when to evacuate under stages, when to de-rig structures, when to suspend the event
• Lightning: A lightning action plan — when to move people away from open areas and metal structures, and when it is safe to resume
• Extreme heat: Drinking water provision, shaded areas, welfare monitoring, amended medical provision in heat events
• Heavy rain and flooding: Temporary flooding of access routes, slippery surfaces, electrical hazards from water ingress

Obtain professional weather forecasting (Meteogroup or similar) in the 72 hours before the event, not just a standard weather app. Monitor a dedicated weather station during the event if possible.

7. Counter-Terrorism (Martyn’s Law)

Since April 2025, the Terrorism (Protection of Premises) Act 2025 — Martyn’s Law — imposes legal duties on event organisers for events with 100 or more expected attendees. For outdoor festivals:

• Standard Tier (100–799 people): Counter-terrorism awareness training for all staff and a written emergency response plan covering terrorist incident scenarios.
• Enhanced Tier (800+ people): A formal CTSA-level security assessment, CCTV, access control procedures, hostile vehicle mitigation where appropriate, and a tested communications plan with police.

Common Outdoor Festival Safety Mistakes

• Underestimating attendance at free events — without ticket sales as a control, free events regularly exceed expected capacity. Build in a clear plan for stopping entry when capacity is reached.
• No wind speed trigger points — structures are erected without anyone knowing at what wind speed action must be taken. By the time the storm arrives, it is too late to take an orderly decision.
• Assuming the venue takes care of it — for events on private land, the landowner typically has no obligation to provide safety infrastructure. That falls on the organiser entirely.
• Under-resourced medical provision — a single first aider for a 2,000-person event in hot weather with alcohol is dangerously inadequate. Medical provision must scale with risk.
• No tested communication system — event day is not the time to discover your radios are on the wrong channels or that your site has signal black spots.

Outdoor Festival Safety Checklist

Frequently Asked Questions

Do I need a licence to hold an outdoor festival in the UK?

If your festival involves regulated entertainment (amplified music) or the sale of alcohol, you will need either a premises licence or a Temporary Event Notice under the Licensing Act 2003. You will also typically need the landowner’s permission and, for events on public land, a licence from the local authority. The licensing requirements are separate from — and in addition to — your health and safety obligations. Failing to obtain the necessary authorisations can result in the event being shut down by police or the local authority on the day.

How many stewards do I need at an outdoor festival?

The Purple Guide recommends a minimum ratio of 1 steward per 250 attendees as a starting point for outdoor events, with higher ratios at front-of-stage areas (typically 1 per 100–150). Your actual requirement depends on your specific site layout, expected crowd behaviour, alcohol provision, and the age profile of your audience. A risk assessment should determine the appropriate figure for your event. Never round down — if your calculation gives 23 stewards, deploy 24.

What is a Safety Advisory Group and do I need to engage with them?

A Safety Advisory Group (SAG) is a local authority-convened group that typically includes representatives from the council, police, ambulance service, and fire service. They review Event Management Plans and provide multi-agency advice on safety planning for significant events. Engagement with the SAG is strongly recommended for any outdoor festival above approximately 500 people, and is required for events on public land. SAGs do not have direct legal powers to close events, but police and the local authority do — and SAG engagement ensures those authorities are informed and supportive.

What happens if someone is injured at my festival?

If someone is injured at your event, your primary obligation is to ensure they receive appropriate medical attention. You should also record the incident in writing and preserve any relevant evidence (CCTV, steward logs, site plans). Serious injuries must be reported to the Health and Safety Executive under RIDDOR (Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 2013). Your event insurance should cover the incident, but insurers will examine whether your safety planning was adequate — an incomplete or inadequate EMP significantly weakens your position.

How far in advance should I start safety planning for an outdoor festival?

Serious planning should begin at least 6 months before the event for anything above 500 people, and 12 months or more for a first-time festival or an event above 5,000. SAG engagement typically happens 8–12 weeks before the event, but the preparatory work — site surveys, structural design, medical planning, licensing applications — takes months. Event organisers who begin safety planning 6 weeks before the event consistently produce inadequate documentation.