When we went on the 30th they only had one line open to see Minnie, the mice from Cinderella, and Cinderella with Prince Charming. Everything is open in ToonTown during the party except the Train.
later in the evening, that part of the park dies out on off-nights. we've actually surprised Cinderella, and have found Donald standing all by himself. the Alice in Wonderland characters reside on the path to Tomorrowland, along with lots of candy. very cool.