A leap day was first introduced over 2000 years back, by Julius Caesar. There are traditions, folklore, and superstitions ever since its introduced.
Women propose to men
According to an Irish legend, St Brigid struck a deal with St Patrick to allow ladies to propose men instead of the opposite way (men proposing women). So the ladies get a chance, once in four years to balance the traditional roles of men and women.
A dozen of glove pairs.
In some places, a man is expected to pay a penalty, such as a gown or money if he refused a marriage proposal from a woman on leap day. In some countries of Europe, the tradition calls the man to buy 12 pairs of gloves for the woman. So the woman can hide from the embarrassment of not having an engagement ring. During the past in the middle ages, there were even rules regarding this.
Scotts consider the ones who are born on a leap day unlucky. Greeks consider it unlucky for couples to marry on a leap year, and especially on a leap day.
St Oswald’s Day
Leap day is also named as St Oswald’s day after the archbishop of new york who died on 29th February. The day is celebrated on 29th February on leap years and 28th on normal years.