Sadie Hawkins Day is February 29. It rolls around once every four years. And the import of this unofficial holiday is that on Sadie Hawkins Day it's considered acceptable for a woman to propose to a man.
Al Capp, a cartoonist, went on to create the story of Li'l Abner, a strapping, handsome hillbilly from the fictional town of Dogpatch USA.
It involved a romance between Li'l Abner and Daisy Mae, a buxom young blonde (and the inspiration for the denim short-shorts dubbed "Daisy Maes"). L'il Abner became a Broadway musical and later a 1959 film starring Peter Palmer as the lead and the unknown Leslie Parrish as Daisy Mae.
Daisy Mae is in love with Li'l Abner, and intends to ask him to marry him on Sadie Hawkins Day. But through a plot twist, she is foiled by an evil character named Appassionata von Climax, who proposes to our hero first.
In the film Sadie Hawkins Day is greeted with great glee by the women of Dogpatch as they race around town in hot pursuit of the backwoods' most eligible males.
Sadie Hawkins Day, when it is celebrated, typically features a dance that women invite men to and ask them to dance. That doesn't mean some reverse-sex proposals aren't made on this day -- and some joyful and long-lasting marriages are the result.
And if you're wondering what happened to Daisy Mae and Li'l Abner, their story ended happily. The got married and loved happily ever after.