Get your free tickets now! Update: Sold Out. Keep checking in case more are released.
Update 2: Tickets are now available for the studio audience taping of the Kimmel show. This should also get you in to the Interpol concert. Here's what the website says:
TICKET HOLDERS: You will see the studio portion of the show (Jimmy, guests, interviews...) and the mini-concert regardless whether it is indoors or outdoors. (Thanks Ryan)