It's difficult to put large crowds of people together in a small area without something going wrong, but some concerts stand out for the amount of violence, injuries, and even death. This list tells about the big ones you recall, Altamont in 1969, Cincinnati in 1979, and Woodstock. Oh, the 1969 Woodstock Music Festival was quite famous for poor conditions, but for bloodshed, it couldn't hold a candle to the 1999 version:
Serious violence occurred on the Saturday night (July 24). During Limp Bizkit’s performance, a crowd-surfing woman was allegedly gang raped in the mosh pit, and there were several other reports of rapes and sexual assaults as well. Indeed, police investigated at least four rapes following the concert.
During Limp Bizkit’s song “Break Stuff,” the audience ripped planks and pieces of plywood off the walls. And the concert concluded with bonfires during Red Hot Chili Peppers’ encore, with parts of the security fence being ripped down and used for fuel.