Hi there, Elaine!
You've picked a fantastic time to visit the Walt Disney World Resort! The Holiday Season is so magical and there are festive decorations covering practically every square inch of the entire property.
Wishes nighttime spectacular is a fireworks show that takes place over Magic Kingdom Park every evening. I've looked at your dates on the calendar and I do see that Mickey's Very Merry Christmas Party is taking place on 12/17, 12/19, and 12/20 with a special Holiday Wishes at 9:30 p.m. on each of those evenings. On 12/18; however, Wishes will be at 9:00 p.m. If you are still planning your days, you could make sure that you spend 12/18 at Magic Kingdom Park!
Another recommendation I have is to make a dinner reservation at one of the fantastic restaurants located at either Disney's Contemporary Resort, Disney's Polynesian Resort, or Disney's Grand Floridian Resort & Spa. Depending on what time you are able to reserve, you can go outside and watch the fireworks from the grounds of each of these Resort hotels. You can even watch Holiday Wishes from these locations as well. The music from the show is typically piped in and you'll feel as though you are right there!
The California Grill at Disney's Contemporary Resort has been closed for quite some time while receiving an extensive makeover and they are getting ready to open reservations up in just a few short days! Watching Wishes from this location is one of my very favorite locations! Check out this article from the
Disney Parks Blog with more details!
Thanks for stopping by the Moms Panel with your question and please feel free to write back in if you have any others. I hope this helps!
Wishing you a Pixie Dusted vacation!
~Jackie