Bavaria, Germany, here.
Here and in other catholic regions, St Nicholas Day is the 6th of December, and it used to be a tradition that some person disguised as St Nicholas (imagine him like Santa Claus) was accompanied by his sidekick, a man dressed in a brown monk's gown and with a sack, known as "Krampus" or "Rufus the monk". Allegedly, children who didn't confess their yearly sins to St Nicholas (who read them from a book the parents gave him) would go into the sack, but if they'd promise to obey the next year, Rufus the Monk would have some gift for them in his sack.
As this is considered too frightening for some children nowadays, they usually skip the Rufus, but you can rent a Santa on 6th december in every major town.
It's a minor holiday, however. My family still celebrate it, but as there are no little kids around, usually with a plate of walnuts and tangerines, and a candle in the middle. Walnuts grow here in abundance and are just dry enough to eat at that time, and tangerines come from the middle east, where St Nicholas was from.
St Nicholas, btw, is the patron saint of all refugees. I don't think we need a special day to think of them, but if you're catholic, think twice.