Merrill Garbus’s tour in support of her third (terrific) Tune-Yards album, Nikki Nack, is winding down now, but not before she comes to Brooklyn for four shows at Music Hall of Williamsburg this week. There are still tickets to see her on Sunday, but her Thursday, Friday and Saturday appearances are already sold out. However, The House List is giving away two tickets to see Tune-Yards on Saturday night. And if you want ’em to be yours, 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 (Tune-Yards, 12/6) and a brief message explaining why December rocks. Eddie Bruiser, a fan of Nikki Nack and the twelfth month, will notify the winner by Friday. Good luck.