Hello there Sung, and welcome to planDisney!
Thanks for swinging by with your question. We love to help guests just like ourselves with their magical trip planning. Sounds like you've got a visit to the Happiest Place on Earth on your radar... woo hoo! If you've got flexibility in your travel schedule, it certainly never hurts to double check that your favorite rides and attractions are going to be available.
The best thing to keep an eye on is the Disneyland
Parks Operating Calendar. While this may be subject to change, this is a good place to check. First, select the dates you're planning to visit from the calendar. This will then display a helpful parks schedule for both Disneyland and California Adventure Park which includes things like park hours, as well as parade and show times. Scroll towards the bottom of each park's schedule, and if any attractions are planned for refurbishment on that date you'll see it listed in a "Closed for Refurbishment" section at the bottom.
Currently, I do not see any rides closed for refurbishment in December. It looks like starting in January some attractions like
Grizzly River Run and
Incredicoaster will experience a planned closure. Again, if your dates are too far out... the refurbishments may not yet be on the calendar. So I would continue to check as your visit dates get closer.
Sung, I hope this helps and that your magical plans come together beautifully. Have a wonderful time at Disneyland! And please feel free to visit us again at planDisney if we can assist with any other questions.
Sending pixie dust,
Tami