Mikulás
Mikulás (or Szent Miklós) is the Hungarian version of Saint Nicholas, and a similar figure to Santa Claus. In many cities, Mikulas is getting more conflated with Santa Claus. Still, it is believed that Mikulas arrives to celebrate his day, December 6, and leaves before Christmas. This tradition is also well known in Romania (Moș Nicolae), Slovenia (Miklavž),the Czech Republic, Slovakia (both Mikuláš), and Poland (Mikołaj).
Treats
Although the role of gift-giver on Christmas Day itself is assigned to the Christ Child, on the eve of Saint Nicholas' feast day of 6 December Hungarian children traditionally place a boot on their windowsill waiting for Mikulás to come by and fill it with treats.
There is no Mrs. Mikulas in Hungary. In the Czech Republic, Slovenia and Slovakia, Mikulas/Miklavž often comes with two assistants: a good Angel who gives out presents to good children and a “Krampusz”, a mean elf, in some version a Devil, who punishes bad children.
On 5 December, they come to the houses where small children live and give them some presents. While "good" children receive various fruits, candies and toys, "bad" children can expect nothing more than a wooden spoon, several pieces of coal or carrot or potatoes left by Krampusz. (However, as no one is either all good or all bad, most children get both sweets and a switch.)