We try to coincide with the national day of civic hacking, which is around then (but not definite). Last year, conflicts with the organizer's schedules meant that we did it the week after.
So, it will probably be near that weekend next year, but not definitely, so no real way to schedule it. The best thing to do is to make a calendar event for January to reach out to the organizers to get a sense of when it might be.