Hi Brad and welcome to the Disney Parks Moms Panel!
I love that you're trying to maximize your day at Magic Kingdom Park when it will be closing early for
Mickey's Very Merry Christmas Party! Magic Kingdom Park closes at 6 p.m. on party days. If you would like to book a
dining reservation at one of the fabulous restaurants in Magic Kingdom Park on a party day, you will need to find a reservation before 6 p.m.
I have seen some people say they were able to secure dining reservations for 5:45 p.m. but most were for an earlier time. If you find a reservation for, let's say, 5:30 p.m., you would be able to keep that reservation and enjoy your dinner at your own pace. After dining, you would be gently directed to the park exits.
Brad, thank you for visiting us with your question. I hope you'll let us know if we can help you with any other questions!
Wishing you a magical vacation,
Amy H.