Illegal shows and music fests were common here on native reservations, in forests and abandoned buildings until overdoses happened so much the scene was killed. At the time Nicholas Sand was hiding from the FBI and flooding the local market with high purity lsd/mdma ect. https://en.m.wikipedia.org/wiki/Nicholas_Sand When his lab was busted fake drugs started being peddled at these events causing enough problems the police and reserve police took zero tolerance of any unlicensed shows/raves.

I've also noticed in the beginning, when it's just people involved in that scene, there's no problems. It's when popularity of your illegal festival spreads and outsiders show up who have no connection to anybody involved that problems begin, such as meatheads who eventually turned up on a regular basis to these parties to throw punches, set fires and sell piperazine derived pills.