Had a quick look at the MerleFest website. There is camping onsite. Not much info on camping readily available other than you can arrive on Tuesday before.
Looking at a few pictures, the thing is HUGE!!!! Not our style for size but I'll bet the music is great. We try to work bluegrass, or other music festivals into our trips but look for smaller festivals with onsite camping, 1, maybe a couple stages & plenty of after show campground picking, often the best part.
Boat: 32' 1996 Albin 32+2, single Cummins 315hp
40+ night per year overnighter