Event safety plans: standards for monitoring, alerts and PA

The question behind every event safety plan

Anyone seeking approval for a large event has to show the authorities that three things will work. You will notice in good time when an area is becoming too crowded. You can reach the people on site in an emergency and give them clear instructions. And afterwards, you can prove what happened, when, and who responded how.

Each point is covered by rules from very different fields: building regulations, fire detection, video surveillance, electroacoustics and crowd science. This article sorts out the most important ones and translates them into requirements for the technology – for event organisers, licensing authorities and safety planners.

Important: this article is not legal advice. What counts is the law in your jurisdiction – in Germany, in particular the places-of-assembly regulation of your federal state – and the conditions set by the competent authority for your event.

The rules at a glance

Rule or standard	What it covers	What it means for the technology
MVStättV (state version)	Sizing of places of assembly in Germany	2 people/m² for standing areas as the basis for capacity
Fruin, Still, HSE Event Safety Guide	Density, movement and crowding	Measure density in people/m², use levels instead of gut feeling
EN 50518	Monitoring and alarm receiving centres	Clear alarm handling, response times, escalation
VdS 2366	Video surveillance – planning and installation	Detection requirements, image analysis, alerting
ISO 22313	Security and resilience – guidance	Defined emergency procedures, protection of people
DIN 14675, VdS 2095, NFPA 72	Fire detection and alarm systems	Never reset a fire alarm automatically; verify and document
EN 54-16	Voice alarm control equipment	Voice messages in a fire, integration with fire detection
DIN EN 50849 (VDE 0828-1)	Sound systems for emergency purposes	STI ≥ 0.5, level ≥ 6 dB above ambient noise
IEC 60268-16	Measuring speech intelligibility	Measure STI on site using STIPA

Crowd density: building law meets crowd science

The MVStättV is the German model regulation for places of assembly, which each federal state adopts in its own version. For standing areas it assumes two people per square metre, which determines how many visitors an area may hold. During the event, this figure alone says nothing about whether people are bunching up at the stage or an entrance while the rest of the site is empty.

This is where crowd science comes in. In 1971, John J. Fruin described a “level of service” scale ranging from free movement to dangerous crowding. G. Keith Still condenses practice into a rule of thumb: from around 2 people/m² movement is restricted, from around 4 it becomes dangerous, and from around 6 it is a crush. The UK Health and Safety Executive’s Event Safety Guide also draws on this kind of density assessment.

Alerts and alarm handling: EN 50518, VdS 2366, ISO 22313

EN 50518 sets requirements for monitoring and alarm receiving centres – that is, for how alarms are received, handled and escalated. VdS 2366, a guideline from the German loss-prevention body VdS, covers the planning and installation of video surveillance systems, including image analysis and alerting. ISO 22313 is guidance on security and resilience that calls for defined emergency procedures. None was written for open-air events, but together they set the benchmark for how a control room handles alerts.

Fire: DIN 14675, VdS 2095, NFPA 72, EN 54-16

DIN 14675 (the German standard for fire alarm systems) and the VdS 2095 guideline contribute a principle for every control room: a fire alarm is never “cleared” by itself. Qualified staff verify, reset and document it. EN 54-16 covers voice alarm control equipment, which links fire detection with spoken messages.

Public address and emergency communication: DIN EN 50849 and IEC 60268-16

For sound systems used for emergency purposes, DIN EN 50849 (VDE 0828-1, the German edition of EN 50849:2017, which replaced the withdrawn EN 60849) requires speech intelligibility of at least STI 0.5 – on a scale from 0 (unintelligible) to 1 (perfect). Announcements must be at least 6 dB above ambient noise. That is demanding at events: trade fairs typically reach 65–75 dB, concerts 80–100 dB and open-air festivals up to 110 dB. A margin of 10 dB is therefore advisable for evacuation and fire messages. Intelligibility is measured to IEC 60268-16 using the STIPA method – on site, because the space, noise and distance determine the result.

What this means for the technology

Measure density, don’t estimate it

If your safety plan states density limits, you need a method that checks them during the event: count people in clearly defined areas, relate the count to the actual floor area and express it in people/m². Several levels with an early warning let the control room act before a critical threshold is reached. The thresholds belong in the plan and should be adjustable to each area.

Evacuation and announcements

An announcement is only useful if it reaches the right place and is understood. So: plan loudspeakers so that level and coverage suit the site; address areas individually to redirect people without alarming everyone; prepare texts for evacuation, fire, crowding, medical incidents and severe weather; offer several languages; and prevent accidental triggering. Where several loudspeakers cover overlapping areas, their delays must be aligned, otherwise echoes reduce intelligibility.

Records and evidence

A safety plan describes what is intended. After an incident, however, what matters is what actually happened. That requires a complete trail: when an alert was raised, who saw it, when they responded, and which announcement was played where and in which languages. An image captured at the moment of the alert keeps the situation traceable later on.

How MOVETOS OPS supports this

MOVETOS OPS is a platform for situational awareness, alerting and announcements at events. Where the ground has been calibrated, it measures density directly in people/m² and maps it to the Fruin scale. It comes with four levels – free, busy, crowded, very crowded – with thresholds of 1.0, 2.0 and 3.5 people/m², based on Still’s rule of thumb and adjustable. Without a calibrated ground, it works with the share of each area’s capacity. Planning derives each area’s guideline visitor figure from 2 people/m² (MVStättV); an approved visitor number, once entered, takes precedence.

Alerts for fire, panic and weapons never close by themselves; a person has to verify and clear them. Automatic detection of falls, fights, panic, fire and weapons is in pilot operation.

The platform suggests suitable announcements for alerts. The system suggests, a person approves. Announcements can be sent to specific locations, play in several languages and are triggered by pressing and holding. Speech output and translation also work without an internet connection. Loudspeaker planning uses the target level from DIN EN 50849 with a 6 dB margin; it does not replace an on-site STI measurement.

Every deployment is documented in full: the incident log writes itself – each alert with its time, whether it was seen, cleared or marked as a false alarm, with a still image as evidence, and each announcement with its text, languages, loudspeakers and the person who triggered it. A final PDF report summarises density over time, response times and announcements. For the approval process, the platform provides a contribution to the safety plan with site plans for video, public address and radio links, the alert profile, prepared announcements and a chapter on data protection. Anything only the organiser knows – escape routes or the medical service, for example – is left there as a field to complete.

Checklist for your safety plan

• Capacity: set in line with the applicable regulation and the authority’s conditions?
• Density limits: levels in people/m², with early warning, named and justified per area?
• Critical areas: entrances, front of stage and bottlenecks covered by measurement?
• Alarm handling: who sees an alert, who decides, where is it escalated – and within what time?
• Fire: fire alarms verified and cleared only by qualified staff?
• Public address: level at least 6 dB above expected ambient noise, STI ≥ 0.5 measured on site with STIPA?
• Announcements: texts ready, languages agreed, areas individually addressable?
• Failure: do alerts and announcements still work without an internet connection?
• Records: alerts, responses and announcements logged with time and person?
• Evidence: a report after the event that you can present to the authority?

Note: this article does not constitute legal advice. The standards named here are for guidance; the law in your jurisdiction and the conditions set by the competent authority are binding.