An air mattress like this one is also one of the things I can't do sasquatch without. If you have some extra dough before sasquatch hits you will be really happy if you invest in good camping equipment.
camp stove frying pan pot (either a, or some) flipper canned soup, beans, chili, whatever you're into air bed tent sleeping bag extra blanket pillow cooler lots of ice frisbee (and assorted other games) flashlight/headlamp backpack to take stuff into the venue anything and everything caffeinated music for at the your site extra TP TENT STAKES AND MALLET wet naps or you can get one of those giant wet nap-type towel things. very convenient. paper towel many many pairs of socks. changing your socks halfway through the day is fucking glorious sunscreen bug repellant ear plugs sunglasses some type of hat (preferably hilarious) beer utility belt camera travel mug one of these
and most importantly, make sure you can lock it all up while you're at the show. last year our tent was ransacked. luckily all they got was a flashlight (although it was a pretty sweet flashlight )
Alex, somebody ransacked your tent? If anybody ever sees somebody in a tent you know they don't belong in, Fucking cripple them.
Beer Utility belt is a great idea. Any sort of drinking apparatus is a great idea, we saw some folks last year who somehow fashioned about 5 shot glasses to a snow ski and simultaniously took them by lifting the ski to thier mouth. We're totally stealing that idea this year. If you need a beer bong see know id yuh.
Another great tip. if you plan on bringing meat (lunch meat, bacon, that sort of thing) throw it in the freezer a week before you go. then by day three that bacon you froze will make some awsome fucking breakfast.