No, it doesn't permit gatherings of more than 2500 people to last longer than five hours without a lot of overhead (money and paperwork):

http://law.justia.com/codes/texas/2005/hs/009.00.000751.00.h...

no, it's just that when you exceed 2500 people, a bunch of special provisions come into play, like having to provide water, security, vending, etc. that clash with the self-reliance/gift-economy aspect of a burn.