Write down all possible risks and who is at risk – be it attendees, crew, members of the public, or the venue itself. Then write down how you will mitigate and manage each risk. This does not need to mean reams of paperwork, just note the basic measures, such as having a first-aider on site and accident report book. Place extra focus on your most severe risks, which must be prioritised and actioned to reduce risk to an acceptable level. It is worth talking to your whole volunteer crew about this as they may be able to spot things that you alone would miss.