“Promote hand washing, respiratory hygiene and social distancing at the event. Make sure you have emergency contact details for all participants, including where they are staying during the event.”
Read more here: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/question-and-answers-hub/q-a-detail/q-a-on-mass-gatherings-and-covid-19
Photo by Riccardo Bresciani