The crowd goes crazy at Firefly Music Festival 2014. (Photo courtesy Firefly Music Festival)

The Firefly Music Festival is returning for its fourth year to The Woodlands of Dover International Speedway in Dover, Del., for a long weekend of Thursday, June 18 to Sunday, June 21.

Festival ticket sales are underway, and early bird tickets already have sold out. Currently, music lovers can purchase $299 festival passes for the entire weekend or VIP packages at higher rates.

But the festival will not offer single-day passes this year, as it anticipates selling out its capacity of 90,000 attendees with full weekend passes, Red Frog Events, the organizer of the festival, announced Wednesday.

“We’ve seen an unprecedented increase each year since Firefly’s inaugural 2012 festival derived from our success in multiple areas,” said Greg Bostrom, director of Firefly Music Festival, in a press release. “This, in turn, eliminated our ability to offer single day general admission passes in 2015 as we plan to welcome 90,000 attendees, which will bring us to capacity this year.”

Headliners for the festival this year include the legendary Paul McCartney, who will close out Friday night. Kings of Leon headline Saturday night and the Killers close out the festival on Sunday. On Thursday, indie pop movers and shakers like Chari XCX and the Kooks are set to appear.

The 2015 lineup also includes Morrissey, Snoop Dogg, Foster the People, Bastille, Modest Mouse, Zedd, Hozier, Empire of the Sun, Kid Cudi and nearly 100 additional acts performing across seven stages, according to Red Frog.

Once the festival sells out of four-day passes at the general admission price of $299, it may offer “Encore” passes at $329.

Tickets are available online, and a payment plan is available for those who purchase before March 31. For more information, visit http://www.FireflyFestival.com.

Firefly Music Festival
The Woodlands of Dover International Speedway
Dover, DE
June 18-21, 2015
$299 general admission
12pm-1am
All ages