Welcome to planDisney, Kristina! I'm happy you're hEAR making plans for your December vacation.
With the
EPCOT International Festival of the Holidays and the new nighttime spectacular,
Harmonious, December is a great time to visit
EPCOT!
Kristina, while there will be a lot of fun in store for your visit, it's always a bit disappointing when you aren't able to secure all of your desired dining reservations. I often will have one reservation per trip that we aren't able to make, so I understand your question.
Biergarten Restaurant, which recently returned to a buffet, is a popular choice for families and while I don't have any official information, my guess is that it's unfortunately booked for your desired date.
My best recommendation would be to check back as often as possible because guests' plans frequently change and you never know when a table might open up. Earlier this summer my family and I were hoping to enjoy breakfast at
Topolino's Terrace- Flavors of the Riviera and couldn't find any availability for our trip. Finally a table opened up 48 hours in advance and we were able to fit it into our plans. Kristina, while there is no guarantee, I'll be wishing on a star that Biergarten Restaurant is in your future.
If you have any additional questions, please come on back to planDisney where never miss an opportunity to say, "Happy Holidays!"
Lauren