Saint Andrew's Day - the day in the national calendar of the Slavs, falling on December 13. It is one of the holidays that starts the winter holiday cycle.
This holiday is considered to be a bachelor. On St. Andrew’s night, the boys are allowed to go out and play pranks.
At the same time, the girls on this day can guess, to know the future, and most importantly - who will be their betrothed. Divination, as a rule, was held on the night of December 12-13.
According to another tradition, girls and boys were supposed to gather in the same house on the evening of December 12 to joke and tell interesting stories.