It seems like it's really hit or miss on whether or not the mice show at the 1900 Park Fare Cinderella's Happily Ever After Dinner. The Allears "Where the Characters Dine" page doesn't have them listed, and neither does the Kenny the Pirate blog, and I did a Google search and several reviews from June of 2011 through August 2012 don't have them listed as being there, but several people here have reported them having been there. It looks like they are there sometimes, but aren't scheduled as being part of the dinner any longer. If you plan on doing any character meals, you might want to go and see if they show up. If nothing else, everything I read says that it is a very fun dinner and the step sisters put on a GREAT show, so I'm sure it will be a good experience.