As noted a few days ago, the My Little Pony movie is up on T-Mobile tuesdays for cheaper tickets. The advertisement is a little bit misleading here.
Open the app on your phone if you are using T-Mobile and pick them up. Unfortunately the service they are using doesn't include a lot of theaters, so at least here in AZ, it's kinda worthless if your specific meetup groups is going to a theater not networked by Atom.
Thanks to BN King for the heads up.