lol, so wait, lemme put this together: music festival + hippies = weed, weed, and more weed.
You shouldn't have any problem finding weed, let alone anything else you might want to try.
I bet you could barter with your hash and find a lot of people willing to make the trade.
Go on the search and see what you can find, just don't go around yelling "I'm looking to buy some drugs" and you will be good.
I have a better chance of becoming the king of england than cops busting you at a festival. They're mainly there for security reasons, and also to TRY and sniff out the more hardcore drugs (no pun intended on the 'sniff' - - lol no dogs don't worry) hope that helps.

p.s. anyone else going to wakarusa in a couple weeks ????