Woody Guthrie Folk Festival
We went to this last year and loved it.
Okemah, Oklahoma is a delightful small town that really puts it's heart into the fest.
This year there were four different venues with live talent. Our favorite was in a basement of a large building. It was cool without having A/C blowing on you and very up close to the musicians who all really play to the group.
There is a campgrounds just down the road at the lake. It's small but very private.
The best thing is the cost is pretty cheap, both for the festival and the camping.