The Slow Food Rocks music festival will take place on August 30 and 31 in San Francisco. Four acts have been tapped for day one, with Gnarls Barkley joined by Ozomatli, The New Pornographers and Medeski Martin & Wood. Then on August 31, Phil Lesh and Friends will headline a bill that also includes G Love & Special Sauce and John Butler Trio. The Slow Food Rocks music festival is scheduled for The Great Meadow at Fort Mason overlooking the Golden Gate Bridge, with tickets now on sale.