Hi Wendy!
It is not unusual not to be able to find in park Table Service dining on the nights of the special event parties. Although
Mickey’s Very Merry Christmas Party has not even begun yet many guests have bought their tickets and are planning their evening of fun.
Quick Service locations will definitely be open during the party time although not all of them. My suggestion is to arrive to the party early starting around 4pm and dine early for dinner before any dining location shuts down for the day. I love
Columbia Harbour House located near the Haunted Mansion for a nice quiet relaxing meal. Head upstairs and find a table by the windows if possible as it is fun to watch the people move by outside. But check out all of the dining options in the park and select the one where the entire family agrees on the menu.
Disney has recently offered guests the opportunity to use the
Pre Order Mobile option in your My Disney Experience App. This allows you to select your foods and drinks, pre-order it, then let them know when you wish to have it fulfilled, and avoid all the lines and simply pick it up. I have used it a few times and love this new option.
You can also keep checking as many times Restaurants will have cancelations and something might open up for the night of your party visit. Good luck but you will find some great dining no matter if you use Table Service or Quick Service.