Leap Day, on February 29, has been a day of traditions, folklore and superstitions ever since Leap Years were first introduced by Julius Caesar over 2000 years ago. Leap day balances the calendar.
According to an old Irish legend, St. Brigid struck a deal with St. Patrick to allow women to propose to men, not the other way around, every 4 years.
It is also known by some as Sadie Hawkins Day. A "tradition" that came from the Li'l Abner cartoon by Al Capp.