It all started with a mysterious mention on Pitchfork of a Gnarls Barkley date at Pimlico. Yes, that Pimlico. That lead The Upstate Life to do a little research. The mysterious event, taking place on September 23, will also feature The Raconteurs, and is called V Fest. We’re hoping that this is an American version of the UK’s Virgin-sponsored annual event, which this year will feature acts like Radiohead, Beck, The Dandy Warhols, Bloc Party…