Hi Nicole!
Thanks so much for stopping by the Disney Parks Moms Panel with your question.
I'm happy to hear you're planning to attend one of my favorite special events at Walt Disney World Resort -
Mickey's Very Merry Christmas Party. This ticketed special event, held on select evenings in
Magic Kingdom Park, is such a fun way to celebrate the season. With special holiday offerings, including the Once Upon a Christmastime Parade, A Frozen Holiday Wish, Holiday Wishes Fireworks Spectacular, and Club Tinsel, guests can have a holly-jolly time throughout the park!
FastPass+ service is not offered during the hours of the Christmas Party, and is not included with the purchase of a party ticket. Guests who visit the park earlier in the day, prior to the ticketed special event, must have a valid theme park ticket to use FastPass+ up until the party begins.
I hope this helps with your planning. Have a magical day! - Diane W.