A change of pace
Regardless of what holidays your family observes, December is a great time to switch up your regular routine. Here are a few ideas:
Do less structured work, and give your kids more free time to learn what interests them. This is definitely the approach my family takes. (Last week, I talked about how I do my own version of Homeschool Lite, and you can read about it here.)
Shift your focus. Instead of doing the wide range of subjects that you normally cover, take a couple weeks to focus on one area of study and hit it from lots of angles.
Try holiday-themed studies. Read lots of books, bake, and create stuff. Watch holiday movies and attend (virtually or in person) holiday concerts and plays.
Switch up your normal routine. Start later and/or end earlier in the day. Or maybe do school less days during the week.
Spend less time on hard-core academic work and more time learning life skills.
Let the kids plan a week of what they want to do. You might be surprised by what they suggest!
My family will be doing school through this week, and then we'll take off a couple weeks for Christmas and New Year's. How about you?