I believe that any big event should be accompanied by an ambulance.
It's really not safe, because I've witnessed more than once an accident at a concert. Not fatal, of course, but still. Once there was an ambulance, the second time there wasn't. I think and know that there should be an ambulance team like this one https://www.valhallamedics.com/event-medical-staff-specialists-are-essential-at-every-event/ . All the doctors in this team are professionals, so they are trusted."