I don't remember doing anything in particular with primary grades.
I like the idea of beginning cursive, learning to manage a binder, etc., kind of a "rite of passage."
We'd usually done a huge rush of "winter" activities before break, which were preceded by a fall festival as well. I believe that, on our school calendar, the 100th day of school usually fell in January, so we would be gearing up for that.
These days, not teaching primary students any more, I give them a chance to turn in any "catching up" they did over break, review the week's schedule and the month's schedule with them, wish them a happy new year, and off we go.