One of the most unassuming places for a festival is Clarksdale, MS. "You've GOT to go," they said. "It will change your life!" It is not a supersonic, hyped up, over the top festival, though it has grown over the years, but there is not another that presents you with true local Mississippi Delta culture all at once, than the Juke Joint Festival. You wouldn't believe it, but it has international fame. Even if you don't like blues, you will absolutely love it, live!
http://www.jukejointfestival.com/
https://www.flickr.com/photos/maximac222/albums/72157680179215694