Yep, if you could book any bands for it, who?
For me....
Children Of Bodom and Lamb Of God headlining.
From there....
At The Gates, Amon Amarth, Opeth, Bleeding Through, Mudvayne, and Lightning Bolt to break up the monotany.
That's just for metal though. I like too many chill bands to actually make a fest around them. ASMZ/GYBE, Mogwai, Iron And Wine, Tom Waits, Azure Ray, Bela Fleck and The Flecktones, Galactic, Particle, Buckethead and all his side projects, Les Claypool and all his projects, Clutch, Cursive, Dave Brubeck, Deerhoof, Del The Funkee Homosapien, Deltron 3030, Dr. Octagon, Busdriver, DJ Shadow, The Black Mages, The Specials, The Skatalites, and I Am Spoonbender would all definitely be in there though.
Oh, and the band/artiste can be dead or alive, don't matta.