If you bought Ticketmaster tickets between October 21st, 1999 and February 27th, 2013 you may qualify.
Login to your Ticketmaster account and click this link. It will list the vouchers you are eligible for.
You may find 2 free tickets, $2.25 off codes and/or $5 off UPS Delivery Codes.
Your vouchers are valid through 2020.