As the Saturday slate inside the Fader Fort by Fiat wound down, buzz was building over the super-secret surprise guest. Diddy? Kanye before his late-night power station show across the highway? Eminem & Dre? Turns out it was the guy from Bon Iver playing with his high school band, Deyarmond Edison (Diddy did introduce headliner Lil' B later on and hit the stage for a few tracks).