Gene from Indiana on 3/29/2013 1:08:28 AM:
While I'm not sure about the music festival times, camping is available behind the Community Center near the trailhead. Go on the left side of the center to the back, turn left for 50 feet +/-, turn right into the fairgrounds. The camping area is on the right just inside the gate. There's an aluminum pavilion there on concrete. You can use the Center but check there first.