But, apart from that, you're just plain wrong. Did you even check?
(http://www.glastonburyfestivals.co.uk/information/tickets/20...)
> 4. Admission is at Ticket Holder's own risk. Glastonbury Festival 2013 Ltd and the Premises Licence Holder will not be held liable for any loss, injuries or damages sustained at the event including damage, theft or losses to property and motor vehicles, if the cause is due to the negligence of the ticket holder or the actions of other patrons or third parties or force majeure.
When I was in college I played a lot of intramural softball. Of course you had to sign a release that if you get hurt in the regular course of the game the school wasn't liable. Fair enough. My problem was that they allowed these insane metal softball bats, triple-walled ones that can turn Gary Coleman into Jose Cabrera. As the pitcher I didn't like balls flying at my head (insert gay joke here) at those insane speeds.
I complained and was promptly told 'you signed a waiver'. I made it clear that I didn't sign a waiver for negligence and they were being negligent by allowing unsafe bats, moreso now that I've brought the issue to their attention. They changed their tune pretty quickly after that.
I know Burningman has a _very_ strong "hipster douchbag" reputation these days (and I won't argue that it's not at least somewhat deserved) - there is definitely something more than that as well.
(1) http://galleries.burningman.com/photos/klammerd/klammerd.995...
(2) http://galleries.burningman.com/photos/silver/silver.3577
(3) http://galleries.burningman.com/photos/mr_fang/mr_fang.21326