There is also precedent in English law. February 29th was ignored and had no legal status. People believed that traditions would also have no status on that day and that it was possible to have women propose thereby altering an unfair custom that only let men propose marriage.
In the United States, some people refer to February 29th as Sadie Hawkins Day with women allegedly having the right the right to run after unmarried men to propose.
Sadie Hawkins was a female character in the Al Capp comic strip Li'l Abner.