There are two things you have to do.
1. Don't worry about getting sent home or it wont be a good prank.
2. Do it so you don't get caught and sent home.
I would dress up as big foot and trash all the tents if I were you.
Either that or get everyone scared when its time for bed by praying to the devil.
Save some chicken bones and before bed tell everyone its time to roll the bones.
Then the next day have a friend pretend to be possessed and wanting to kill a virgin.
Those jokes would be a laugh riot.
If you do it right you will have a bunch of kids crying for mommy.