2021 Firefly Music Festival will be held in Dover, DE at the The Woodlands Of Dover International Speedway on September 23-26. Billie Eilish, The Killers, Tame Impala And Lizzo are scheduled headliners. Additional artists performing include Megan Thee Stallion, Cage The Elephant, Roddy Ricch, Wiz Khalifa, Machine Gun Kelly, Diplo, Portugal. The Man, Khruangbin, Nelly, Madeon … More Firefly Music Festival Promo Code for their 2021 Dates Online at Capital City Tickets