What are you performing?
If you like mini golf, you might like this quite unusual course: https://rusticgolfindy.wordpress.com/
There are plenty of breweries and restaurants, but I'm out of the habit of going out, so don't have a lot of recommendations handy. That being said, I'm fond of Duos Indy. http://www.duosindy.com/
One of Indianapolis' best qualities is that it's downtown is compact and walkable. But where to walk to? The canal is pleasant. City Market is old timey and has lots of little restaurants (including a Duos Indy spot, though they probably don't have the full menu). You might want to head to the lobby of the Crowne Plaza Indianapolis and see if they'll give you a tour of the areas that were converted from the old train station, including some hotel rooms that are inside old rail cars.