Hi there, Kelli!
I'm so glad that you stopped by the Moms Panel with your question. I'm happy to set your mind at ease.
Please don't worry about your Fairytale Dining experience at Cinderella's Royal Table during
Mickey's Not-So-Scary Halloween Party. You're absolutely right, the
Villains’ Sinister Soiree: A Wicked Takeover of Cinderella Castle will be taking place inside of
Cinderella's Royal Table, but not during the time dinner is being served. I gave a quick call to a Cast Member at Disney Dining and they advised me that the very last dinner seating takes place at no later than 8:00 p.m. and that the first reservation time for the Soiree is at 9:55 p.m. after Lady Tremaine has taken over the Castle.
You will still have the Disney Princess experience that you have been looking forward to! I sure hope this helps to clear things up. Please don't hesitate to write back in with any other questions you have.
Wishing you and your family a Pixie Dusted vacation!
~Jackie