Apparently, Larry Forkner wrote the play and introduced it to some audiences 13 years ago, but it wasn't widely released as far as I could tell. But now he has put it on the stage again in Utah and maybe other states. You can get more info at their website or Facebook page.
A brief summary of the play: Erin's Promise is the heartwarming story of Angela and Erin, two best friends in the pre-existence, who are separated when Angela leaves to go to earth in the 1800s. Angela fears with the gospel being so new and living in England she won't have a chance to hear the gospel during her time on earth. Erin makes a solemn promise to Angela. If she is not able to hear the gospel in her lifetime, Erin will make sure that her temple ordinances are completed when it's her turn on earth. Or will she?
The play has some fun/funny song and dance numbers and was cute. I was thinking while I was watching it that it reminded me of a road show. I miss road shows! It was kinda cheesy, but fun. Alexander said he liked it and was glad he went. He was singing one of the songs the next day. (You can listen to a little of each of the songs on their website or buy the soundtrack.) I don't think it'll be a big hit like Saturday's Warriors, that they compare it to, and was glad I didn't pay the normal $12 ticket price, but we had a good night.