Hey, Jaynee!
I am so glad to help you. That's what members of the Disney Parks Moms Panel do best.
If your
Mickey's Not-So-Scary Halloween Party tickets are showing up in your Disney account through My Disney Experience then you are all set. When the ticket cards arrive in the mail I would crosscheck the ticket number in your Disney account with the number on the card just to be safe.
We typically carry our special event tickets into Magic Kingdom Park even though we use MagicBands for everything. I would also take a picture of my party ticket just in case you have issues such as loss of ticket or admission is denied. Better safe than sorry and I wouldn't be caught dead missing this party. ;)
Disney Dad Tip: Bring a backpack for candy. During the night, you will trick-or-treat along candy trails. You will be provided with a small bag and Cast Members will put candy only in the small bag. You may then transfer the candy into the backpack. We have gathered over 10 lbs of candy only visiting half the trails.
I hope this helps you have a ghoulishly delightful Halloween Party in Magic Kingdom Park.
Jaynee, enjoy making many Spooktacularly Magical Memories!
~Jason ºOº