I will also mention that drug use is always heavy wherever a group of high school and college age people gather. Despite media depictions of designer drugs like ecstasy, they are not exclusive to the rave scene. They have been found in house parties and clubs for years. The side that people don't often hear is the side for why raves should be allowed to continued. Particularly after the incident at Hullabaloo 17 at the Docks Nightclub, people have confused that isolated incident of violence with the violence that happens in many night clubs.
Raves are usually incredibly passive environments.
Of all the parties I've ever been to, there has only been one where a fight has broken out. It was a party with an age of majority room and two guys had gone in there and gotten drunk. They came out into the dance floor and one flirted with the other's girlfriend. A fight began. Almost as soon as it started though, everyone around the two broke them apart.