Just in case you missed it, especially since there was a delay initially, the Advent Calendar has started distributing gifts! There’s already a couple available, and you can find it at the Forest.
Each day, from midnight PST, a new window will open within the calendar. By clicking it, you’ll be able to obtain a new gift; at the time of writing, there’s only been items and a pin, but there may be a wider variety soon!
All of these generally tend to be free, so it’s definitely not something to miss out!