Goth Court is a live-action party game (based on Ghost Court) about eldritch justice in a small claims court that settles petty disputes between goths and norms. It is perfectly suited for a large group, but you can play with as few as six players.
Cases last a few minutes and are ridiculous. A typical game takes an hour, but you can keep playing as long as everyone is having a good time.
These are the rules for Goth Court; you'll need the deck of role and case cards, and five or more friends, to play.