Probably a festival.
It's on July 9th and we have some Festivals around here during Summer.
Board shorts and surf shirts can be worn anywhere and all surf wear purchased is tax exempt for the day.
By burning castles, bridges, perhaps a forest or two. Sending apes to Mars, as well.
It would be called something like National Accidentally Hurt Yourself Day, or National Hit Your Head Against an Immovable Object Day.
And everyone would be contributing $5.00 to the cause. lol
my 21st birthday was on mothers day
so I guess it would be celebrated by getting drunk with mom