Not only can you buy Katy Perry’s Teenage Dream album next Tuesday, you can also attend her Letterman performance the same day. That’s right: Vulture is giving away two pairs of tickets (that’s four in total) to see the rubber-dress enthusiast play Letterman next Tuesday, August 24, at 7 p.m. (not including the rest of the Letterman show, which is filmed earlier in the day). All you have to do is write one (1) compelling Katy Perry–themed haiku, post it in the comments, and the two best haikus win. (To refresh: A haiku is a poem of five, seven, and five syllables.) Peruse the official rules, then post your haiku anytime between now and 8 p.m. on Sunday, August 22. Oh, and be 18 and older, and be available to attend an event at 7 p.m. next Tuesday in midtown Manhattan, of course. Good luck to you. (And for anyone who can’t write haikus, doesn’t live in New York, or hates concerts, Katy will be streaming the album in full, exclusively, on her Facebook page, starting Sunday night at midnight.)