Hey Howdy Hey Heather and welcome to planDisney!
Mickey's Very Merry Christmas Party is such a fun way to experience Magic Kingdom with a little extra Holiday spirit. There is no better way to celebrate the season than with your favorite characters in your favorite park celebrating the Holidays all evening! There will be so many things to experience and attractions are one of them. Thank you for your question about Tiana's Bayou Adventure and TRON Lightcycle / Run, let's go over what we know so far so you can be ready for your Magical experience!
Both
Tiana's and TRON will be available during the party. At this time, it seems as though all attractions will be available via a stand-by queue and Disney will not be using the virtual queue for any of the attractions during the party. While there will be fewer Guests in the park during the party, these lines should be shorter so you should spend less time waiting in line and more time experiencing the festivities.
I'm sure you know but just a friendly reminder that Guests with tickets to the Holiday party can enter Magic Kingdom starting at 4:00 PM. This will give you plenty of time to get in and experience a few attractions before the party officially starts at 7:00 PM. There is so much to be excited for during this party and one of my family's favorite things is
Mickey's Once Upon a Christmas Parade. Celebrating the season with your favorite characters decked out in their Holiday best and a surprise visit from the big guy himself, Santa! There is no way you can walk away from this party without being in the Holiday spirit!
I hope you are enjoying the planning process of your trip as this is half of the excitement! If you have any other questions let us know, we are always happy to help.
To Infinity and Beyond,
Nick