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This morning, the Landmark Music Festival opened a lottery that will give away 1,000 free tickets to the two-day music festival coming to West Potomac Park, near the FDR Memorial, this fall. The festival also announced that TV on the Radio will join its lineup, which also includes Drake, the Strokes, CHVRCHES, and a slew of local acts like Ex Hex and Ace Cosgrove.

Until 5 p.m. next Wednesday, May 27, you can enter to win one of 500 pairs of passes to the September 26-27 event, which will raise money for the Trust for the National Mall, a nonprofit that supports the care and keeping of America’s Big Patch of Grass, currently America’s Big Patch of Construction Equipment.

Already bought tickets, and pissed that you dropped a hundred or two on a show you could have seen for free? You’re likely in good company. The Landmark Music Festival has been promoted for the past month without any mention of a free ticket lottery (or the free festival areas where non-ticketholders can watch the concerts on a Jumbotron) beyond a brief allusion in a press release.

Incidentally, Arts Desk recently posted a very scientific study of the gender breakdowns of four D.C.-area music festivals’ lineups—a study whose methodology necessitated, among other things, the Googling of 90 metal bands. See how Landmark matched up against Sweetlife, Maryland Deathfest, and Capital Jazz Fest.