Hi Kevin and welcome to the Disney Parks Moms Panel!
It sounds like you're planning a vacation during the most wonderful time of the year.
Holidays at Walt Disney World Resort are truly spectacular. I have attended
Mickey's Very Merry Christmas Party and I'm looking forward to experiencing it with my family this year. I can't wait to see their faces when it snows on Main Street, U.S.A.
You can leave and re-enter Magic Kingdom Park during Mickey's Very Merry Christmas Party but you may find it inconvenient to do so. When you enter Magic Kingdom Park for Mickey's Very Merry Christmas Party a wristband will be placed on your wrist to indicate to Cast Members that you have a ticket for the party. This helps them kindly encourage guests who have not purchased party tickets to make their way to the exits. If you have to or choose to leave the party, please do not remove your wristband. When you scan your MagicBand or ticket for re-entry the Cast Members will be looking for your wristband to verify you have entered previously.
I understand it can be tempting to make dining reservations at nearby resorts or circumstances may dictate the need to leave the party for a bit, but I encourage you to stay for the duration of the party if possible. Leaving and returning the park always takes a bit longer than expected and you want to experience all the party has to offer.
Kevin, thank you for visiting us with your question. I hope you'll let us know if you have any other questions we can help you with.
Wishing you happy planning,
Amy H.