assumptions to consider when organizing a graduation pool party

Answer 1

The party will be safe, and security will be there.

Trained lifeguards will be stationed.

Chaperones will be in a ratio of xx:yy to guests.

Someone will supervise people leaving giving them car key (this can be done by security folks).

Answer 2

Admission by invitation only. (No crashers!!)

Parent-signed release for those under age of legal adult.