I was a lifeguard at summer camp one year and we had contingencies for all sorts of stuff. Make sure one of your leaders coordinates with the people running the camp or event. This helps get the right people to the scene if something happens. For weekend events they use to hand out pamphlets to the unit leaders with the POC for emergencies as well as locations for first aid stations. If this isn't in place it would be a good idea to reccomend starting it.