Thanks to their Mercury Award–winning debut album, An Awesome Wave, Alt-J quickly became very popular. So when the U.K. quartet announced their current North American tour—which brings them to town for a couple of weekend shows, on Saturday at Hammerstein Ballroom and on Sunday at Rumsey Playfield in Central Park—tickets went fast. But you’ve still got another chance because The House List is giving away two tickets to Sunday’s show. Want to go? Try to Grow a Pair. Just fill out the form below, making sure to include your full name, e-mail address, which show you’re trying to win tickets to (Alt-J, 9/15) and a brief message explaining what you most like about Alt-J. Eddie Bruiser, who would sincerely like to know, will notify the winner by Friday.