Hi Dawn,
How fun that you will be able to enjoy
Mickey's Very Merry Christmas Party this year! There is nothing like celebrating the season Disney-style.
You should be able to see your ticket purchases listed in the My Reservations and Tickets section of your
My Disney Experience account. If you see them there, they should also be loaded onto your MagicBands if you are staying at a Disney Resort hotel. That said, I am most comfortable keeping the paper tickets in my bag as a backup just in case. I might be over-prepared but it gives me peace of mind.
If you plan to be in the park on the day of the party, look for Cast Members an hour or so before the party starts and show them your tickets to receive your party wristbands. If you arrive at Magic Kingdom park during party hours, you'll just show your tickets at the gate and get your wristbands there.
Wishing you a very merry holiday, Dawn. Thanks so much for your question!
Andrea U.