The Firefly Music Festival is scheduled for June 21 -23 2013 at The Woodlands of Dover International Speedway in Dover, Delaware. The lineup includes: Red Hot Chili Peppers, Tom Petty and the Heartbreakers, Vampire Weekend, and Foster the People top this year’s bill, appearing alongside Yeah Yeah Yeahs, MGMT, Passion Pit, Kendrick Lamar, Grizzly Bear, … More Firefly Music Festival 2013 Lineup Schedule!