The inaugural Outside Lands Festival in Golden Gate Park on August 22-24 looks to make one hell of a splash in the festival circuit with Radiohead, Tom Petty, and Jack Johnson confirmed to headline the event. Festival organizers expect 160,000 people to attend this three day festival, which will tout environmentally conscious living, and will most definitely place San Francisco on the festival map.

The event, which is one week before Burning Man and two weeks before the Treasure Island Music Festival, will be in Golden Gate Park (formerly known as Outside Lands) on four stages spread around the park. The festival gates will be opening at 11 AM every day, with music starting at 11:30 or 12 and ending at 10:00 PM. Tickets will be going on sale on March 30 at the Outside Lands website.

Another Planet Entertainment, one of the promotions companies behind the Outside Lands Festival, just recently confirmed the headliners and have released the lineup, which is:

Radiohead
Tom Petty & The Heartbreakers
Jack Johnson
Beck
Wilco
Manu Chao
Ben Harper & The Innocent Criminals
Widespread Panic
Primus
Rodrigo y Gabriela
Steve Winwood
Café Tacvba
Broken Social Scene
Regina Spektor
Devendra Banhart
Cold War Kids
Lyrics Born
Andrew Bird
Steel Pulse
Sharon Jones and The Dap-Kings
Galactic's Crescent City Soul Krewe
M.Ward
Drive-By Truckers
ALO
Matt Nathanson
The Cool Kids
Two Gallants
Dredg
Little Brother
Grace Potter & the Nocturnals
Donavon Frankenreiter
The Mother Hips
Black Mountain
Sidestepper
Nellie McKay
The Coup
Goapele
Bon Iver
Ivan Neville's Dumpstaphunk
Sean Hayes
The Felice Brothers
Rupa & the April Fishes
Back Door Slam
K'NAAN