Agree! And hold it in a church gymnasium too! That will put the ACLU into a big tizzy!
If the parents pay for a hall - and it happens to be a Church hall - one would probably offer if for nothing more than help with heat/lights and cleanup - then NO ONE, not even a judge, can have any say.
If it was MY kids prom, they damn well would not be subjected to TSA - or any other pat down goons. NO ONE would lay a hand on them.