They have tickets for December 24

Make reservation online

If you have tickets but you have to make your reservation for the control of people who can enter

You have to look at the website, after acquiring the ticket you have to reserve the turn.

Now before buying your tickets you have to reserve, because the capacity is controlled, I recommend you reserve them in advance. You can buy direct at the box office but you may be surprised that the capacity defined for that day is already full. And now with Omicron they are likely to further restrict the occupation

I don't know, but I understand they celebrate Christmas all December, so every day must be good to go. (There may be fewer people in the week)