My birthday is May 31st, and I'm pretty fine with it. It's at the end of the month, which I like. But it's also at the end of the school year, though, so that means exams.
Apparently, May 31st is also World No Tobacco Day, National Macaroon Day (it's a type of cookie), and Save Your Hearing Day. I've never tried a macaroon, but I guess I'll support the other holidays.
It's also apparently the birthday of Clint Eastwood, Walt Whitman, and John Bonham (assuming that Wikipedia is somewhat factual), which I'm happy with. Also, Ramses the Great became the pharaoh that day.