Last year, Delaware’s Firefly Festival made its triumphant post-lockdown return, moving from spring to fall and bringing a roster of acts like Billie Eilish, Tame Impala, and the Killers to the Woodlands in Dover. This year, Firefly is coming back again, and it’ll once again happen in the fall. The Firefly bookers unveiled this year’s lineup today, and it’s a weird one.