On December 1 we were blessed with a snow day. If we have a day with a lot of snowfall, the kids have some ritual (sleeping with your pillowcase inside out or something) that will bring a day off from school the next day.
It worked! We got a ton of snow.
Kiley and a couple of her friends played out in the backyard with the three little girls for longer than I think my kids have ever played in the snow.
I think an unscheduled day off every once in a while is good for the soul.