Howdy Lynne!
Welcome back to the Disney Parks Moms Panel! Thanks for bringing another great question our way.
I wasn't able to find anything, but sometimes when a theme park closes earlier than normal, especially during the holidays, there is a special event going on not available to the public. I'm not sure if this is the case with the date you've mentioned, but it is possible. If you are really keen on seeing
Fantasmic! (and you should be, it's amazing) I would plan to visit one of the other days and not count on it being added.
Also, I was just down visiting Walt Disney World Resort on behalf of the Disney Parks Moms Panel and had an opportunity to see The Music of Pixar Live on Stage-- it was incredible. If you have the chance, I'd look into
booking the dining package that includes both it and Fantasmic! for a really great evening.
Have a splendid time planning and a wonderful vacation, Lynne! Please visit us again soon if there is anything else we are able to assist you with.
Magical Wishes,
Lauren