I just got this in the mail. Vet Tix is offered through the Dept of Veterans Affairs, which sent me the email, and if you are a vet, you can get free or discounted tickets to concerts and sports events.
You can sign up here: https://www.vettix.org/partner/veteransaffairs
First you have to verify your status at ID Me: https://help.id.me/hc/en-us
I go to a lot of shows, so this could be a pretty great deal for me. Hope it's of use to you guys.!