It's St. Nicholas Eve. Be sure to put your shoes outside your door before you go to bed tonight in hopes that you'll get some candy! And leave a carrot out for his horse.
St. Nicholas of Myra, in present-day Turkey, was a real bishop of the church, and many stories have sprung up around him, including that he delivered a punch in the face to Arius at the Council of Nicea in 325.
Half of his bones were pilfered by the Venetians during the First Crusade and brought to Venice to rest in the church of San Nicolo al Lido (on the Lido).
Here's a link to the Wikipedia page outlining many ways St. Nicholas Day is celebrated around the world.