Now in its sixth year, the annual LOCKN’ music festival at Infinity Downs Farm (1500 Diggs Mountain Rd.) gets underway this afternoon with a Deadhead-focused Jerry Dance Party at 3 p.m., followed by Farmville’s Audacity Brass Band, San Francisco’s Midnight North, the LA blues band Andy Frasco & the U.N., the psychedelic Thai-kwondo funk trio Khruangbin, Austin soul slinger Gary Clark Jr., and the Grateful Dead tribute band Joe Russo’s Almost Dead. And that’s just on the main stage. There will be a whole lot more happening over the weekend, including sets by Edie Brickell, Old Crow Medicine Show, Trey Anastasio, Susan Tedeschi, Derek Trucks, Bob Weir, and Jason Isbell. The ticketing system is complex. You can grab a Thursday ticket for $69 or single day tickets for Friday, Saturday, and Sunday for $139. Multi-day passes are $269 and $299. There are also camping packages, parking passes, and, we’re just guessing, a heliport. Click here for a complete schedule of performers, tickets, and more info.