Burning Man corp. has regional subsidiaries that host the same kind of weirdness on a smaller scale.
There was one hosted for several years a few miles from me.
A couple of years ago one of the attendees drowned in a lake. The landowner was obligated by contract to host again last year but pulled the plug on the event this year.
For a few days every year when it was up and running there were a lot of weird people around the area.