Billie Eilish, Lizzo, Tame Impala, and The Killers will be the headliners at the Firefly Festival when the sprawling music event returns to Delaware this fall.

Those four big names are among over 90 acts that will play at the camping festival — which bills itself as the biggest of its kind on the East Coast — Sept. 23-26 at the 105-acre site at the Woodlands of Dover International Speedway.

Other marquee performers slated include rappers Megan Thee Stallion, Roddy Ricch, Wiz Khalifa, and Machine Gun Kelly, and rock bands Cage the Elephant, girl in red, Band of Horses, and Portugal. The Man, DJ-producer Diplo, funk trio Khruangbin and singer-songwriter Phoebe Bridgers also will perform. Philly acts who’ve landed the gig include indie pop band Mt. Joy and Orion Sun, the stage name of alt-R&B songwriter Tiffany Majette.

Eilish, whose new album Happier Than Ever is due in July, was slated to be a 2020 headliner at Firefly, which was canceled because of the coronavirus pandemic. The teen-goth star who swept the major awards at the Grammys last year will kick off the action with a Thursday night headlining set before the festival moves into high gear the next day.

Firefly, which made its debut in 2012 and has featured Paul McCartney, OutKast, and Tom Petty & the Heartbreakers as headliners, is normally staged in June and was expected to take another year off but surprised music fans in March with the announcement that it was moving to September.

It looks to be part of a busy fall festival season, with the XPoNential Music Festival, which has not yet announced its lineup, scheduled to take place in Camden the previous weekend. Other festivals, including Tennessee’s Bonnaroo and the New Orleans Jazz Festival, that are normally held in the spring have also moved into September and October.

Along with the bands, familiar Firefly features will return like the Dogfish Head Brewery, Silent Disco (in which dancers are all outfitted with headphones), and Treehouse Stage.

A ticket presale begins at 10 a.m. Friday, May 14, and passes go on sale to the general public on Monday, May 17, at 10 a.m. More information is at FireflyFestival.com.