When Will You be Getting Your Sims Ready for Christmas?

I celebrate it when it's Winterfest on my Sim's calendar. Before Seasons I celebrated Christmas on my game during the actual Christmas, but now when they have a calendar it's different.
I don't want to add an extra Winterfest on my Sim's calendar, for example in the middle of summer, just because I happen to play the game on Christmas. It's not that important to me.