Here in Australia it is not just Christmas but also Summer vacation and the end of the school year.
It is very crazy, imagine all the stuff that happens at Christmas - parties, holidays etc and all the stuff that happens at the end of school year - graduations, break ups, dance recitals, proms etc and have them all at the same time of year and that is what we get.
Most gyms close for 2-6 weeks over the summer/Christmas period.
We do Christmas themed circuits for our younger rec kids, so the classes are full of fun Christmas activities. They all get a small gift. Teams have a break up party, bring a plate of food and play games, coaches have a staff party, usually a meal out together.