It is also called the day of Annunciation. Mary was a virgin, a clean maiden, and people believed it was good to wash on that day, becaus the water was supposed to contain soap. It was also good for weather forecasts. On that day the farmers should also start plowing, even if the ground was frozen. On this day all people eat waffles in Sweden.
Most people have an waffle iron and bake the waffles as a dessert.
You can buy waffle mix. Hardly anyone knows about the connection with Virgin Mary anymore.