Crowd Management Security for Public Events | CloseProtectionHire

At 3:06pm on 15 April 1989, Superintendent David Duckenfield ordered the exit gate at the Leppings Lane end of Hillsborough Stadium to be opened. 2,000 supporters flooded into a standing area that was already at capacity. Within minutes, 97 people were dead. The subsequent inquiry, appeal, and inquests occupied more than 30 years of legal process.

The Taylor Report of 1990, the Hillsborough Independent Panel of 2012, and the jury findings of the 2016 inquests collectively established something that crowd safety professionals had argued for years: crowd crush is not an accident caused by crowd behaviour. It is a predictable, preventable outcome of crowd density management failures.

Effective crowd management is a system, not a number. The number of stewards deployed is one component. The design of the entry and egress infrastructure, the real-time monitoring of crowd density, the communication protocols between safety staff and emergency services, and the quality of the pre-event safety management plan are equally important.

Crowd Dynamics: The Science

Density Thresholds

Professor G. Keith Still of Manchester Metropolitan University developed the CrowdRisk methodology now used in UK Home Office guidance, the Sports Grounds Safety Authority’s planning framework, and international event safety standards. Still’s research defines crowd density in persons per square metre (p/m2):

1-2 p/m2: Free-flowing movement. Individuals can change direction, stop, and move independently.

3 p/m2: Constrained movement. Individuals must adjust their movement to others. Comfortable for short periods.

4 p/m2: Contact crowd. Involuntary body contact occurs. Crowd pressure begins to build. This is the planning threshold – density should not exceed this at any point in the venue.

6-7 p/m2: Dangerous crowd pressure. Individuals lose the ability to move independently. Crowd forces can exceed the compressive strength of the human ribcage. This is the threshold associated with crowd crush fatalities.

At the Leppings Lane end at Hillsborough, post-disaster analysis estimated peak densities of 9 p/m2 in specific pens before the crush became fatal.

At the Astroworld Festival in Houston (November 2021), a concert attended by approximately 50,000 people experienced a crowd surge toward the stage during Travis Scott’s performance. Eight people died from compression asphyxia. The subsequent litigation revealed that crowd density monitoring was inadequate and that safety staff lacked clear escalation protocols for crowd emergencies.

Crowd Flow and Pinch Points

Crowd movement behaves with properties similar to fluid dynamics – it flows, accelerates, decelerates, and creates pressure at constriction points. Pinch points (narrow corridors, turnstile banks, staircase entrances) are where density spikes occur. Effective egress design ensures:

• Multiple exit routes with adequate total width to drain the venue within the calculated evacuation time
• No single pinch point through which the entire crowd must pass
• Clear wayfinding to distribute crowd flow across multiple egress routes
• Adequate pre-event holding areas (foyers, concourses) to prevent ingress crush at the start of the event

The Green Guide (6th edition, 2018) calculates egress capacity based on unit widths: the number of 550mm-wide flow units that an exit route provides. A 2.2-metre-wide exit provides 4 unit widths, supporting a flow rate calculable from the guide’s tables.

The Regulatory Framework

Sports Grounds: SGSA and the Green Guide

The Sports Grounds Safety Authority (SGSA) regulates safety at designated sports grounds under the Safety of Sports Grounds Act 1975 and the Fire Safety and Safety of Places of Sport Act 1987. The SGSA issues General Safety Certificates to designated grounds specifying safety requirements including capacity, egress, stewarding, communications, and medical provision.

The Green Guide (6th edition, 2018) is the SGSA’s technical reference. It is not a legal document but sets the standards against which compliance is assessed.

Non-Sports Events: The Purple Guide and HSG195

The Events Industry Forum’s Purple Guide (4th edition, 2022) provides equivalent guidance for non-sports events – outdoor festivals, concerts, public celebrations. It covers planning, risk assessment, crowd management, medical provision, and emergency procedures.

HSE’s Event Safety Guide (HSG195, 2nd edition, 1999, updated guidance sheets since) covers similar ground and has the weight of Health and Safety at Work Act 1974 compliance guidance.

Licensing Act 2003

Events at licensed venues must comply with the public safety licensing objective. Safety Advisory Groups (SAGs) operate informally – they are not statutory bodies – but their advice informs both licensing decisions and the legal standard of care applicable in the event of an incident.

Safety Advisory Groups

SAGs typically include: police (operations and licensing), local authority (environmental health, licensing, emergency planning), fire service, ambulance service, and specialist advisers as required by the event type.

Effective SAG engagement begins early – ideally at the event concept stage. SAGs can identify site-specific hazards (access roads, local transport capacity, proximity to other events), advise on precedents from similar events, and provide coordinated emergency response planning that an event organiser cannot achieve independently.

The Society of Entertainment and Arts Management (formerly the Local Authorities Coordinators of Regulatory Services) published guidance on SAG operation that is used by most local authorities in England and Wales.

Crowd Management at the Seoul Itaewon Disaster

On 29 October 2022, 159 people died in a crowd crush in the Itaewon district of Seoul during Halloween celebrations. The event was not licensed, organised, or formally stewarded. It occurred in a public street.

The Itaewon disaster is significant for crowd safety practice because it demonstrates that the physics of crowd dynamics apply regardless of event governance structures. A public area that draws a large crowd, without crowd management measures, can generate fatal crush conditions as readily as a stadium or licensed venue.

The subsequent South Korean parliamentary investigation found failures in local authority monitoring of the event, police resource allocation, and emergency response coordination. The lessons for public event management: crowd density monitoring should not be limited to licensed events, and local authority emergency planning should account for unplanned gatherings in historically popular locations.

Medical Provision

The Purple Guide Chapter 17 sets out medical provision requirements based on a crowd risk assessment methodology (the Hartley and Penhallow model). Key factors:

Crowd size: Baseline provision scales with attendance. Large events (50,000+) require on-site advanced paramedic capability and a field hospital or treatment centre.

Event profile: High-energy music events with significant alcohol and drug consumption carry higher medical demand than sporting events with comparable attendance. The Purple Guide provides risk-adjusted baselines.

Distance from hospital: Remote sites require higher on-site capability because the evacuation time to definitive care is longer.

Event duration: Multi-day events (festivals) accumulate medical demand differently from single-day events. Festival medical providers typically plan for a casualty rate per 1,000 attendees per day that is distinct from a single-event rate.

St John Ambulance and the British Red Cross both provide event medical services under the Purple Guide framework. Major events should use providers with demonstrated event experience and who operate within the Joint Royal Colleges Ambulance Liaison Committee (JRCALC) guidelines.

For related event security planning coverage see event security planning guide and security for outdoor music festivals.

For the Martyn’s Law compliance framework, NaCTSO venue security reviews, NPSA PSA programme, and the CONTEST Protect strand that creates the legal and advisory context for all public event security – see our protective security advisor guide.