You should absolutely check out Rothbury too...

http://www.rothburyfestival.com/

I've gone to lots of shows, and this is a special one for sure. I went to Camp Bisco for the first time last year and it was alright, pretty dirty though. Rothbury is wonderful, I can't wait to see the lineup this year!

Also, the obvious, Bonnaroo. Wakarusa, All Good, Mountain Jam, Gathering of the Vibes, or any Sound Tribe Sector 9 show