Hello Marie,
Welcome to the Disney Parks Moms Panel! Based on your question and your travel dates, it sounds like you're asking about dinner reservations at
Be Our Guest Restaurant on one of the
Mickey's Very Merry Christmas Party nights. Those dates for 2015 are:
November 8, 10, 12, 13, 15, 17, 19, 20 and 29
December 1, 3, 4, 6, 8, 10, 11, 13, 15, 17 and 18
On those evenings, Magic Kingdom closes to the public at 7:00 p.m. and only those Guests with separate tickets to Mickey's Very Merry Christmas Party may enter (or stay) in the park. I am guessing that the dining reservations at Be Our Guest Restaurant that are made during Party hours are giving a reminder to Guests about that separate ticket requirement, just to be sure you're aware. The menu and experience at the restaurant should be exactly the same, no matter which dinner time you choose.
I hope I understood your question correctly, Marie, but please don't hesitate to write back if I can help in any other way.
Sending you magical planning wishes!
Beth