I think it's pretty obvious which theater production you're working on. At first, I thought it was something to do with "The Great Gatsby". That's just the thing most people think of when they see images of the Roaring Twenties like this. The recent movie version was pretty good. I'm not familiar with the characters of Guys And Dolls. I imagine this is them.
You really did take some chances with how this is a different looking setting. You don't see 1920's stuff like this here. I love the background too. I hope the production went well for you! People seemed to like this enough.