This is a great document produced by the German event community with the support of a number of associations that sets out risk management steps needed to enable events to take place.
In their words "The following recommendations for actions and decisions regarding the phased staging of events in the future show that it is possible to reduce the risks for everyone involved in an event. These recommendations in the form of a step-by-step assessment should be used to evaluate individual event-related risks that evolve with the development of the pandemic and to devise corresponding measures for risk containment and mitigation and thus to ensure the safety and security of all event visitors. It is strongly advised that these recommendations be used as a binding checklist for event organizers. This will enable event planners, organizations, authorities and participants to work on the assumption of the best possible, verifiable situation with regard to the health and safety of everyone involved."