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Davey Havok of the band AFI performs on Day 2 of the 2017 Firefly Music Festival at The Woodlands on Friday, June 16, 2017, in Dover, Del. (Photo by Owen Sweeney/Invision/AP)

Gallery: On the Scene at Firefly 2017

Summer festival season is officially underway! See rock’s biggest stars burn bright at this year’s Firefly Festival in Dover, Delaware.