Oops, it doesn't look like 'stunt on yo ex day' is a national day..

Other days

carpenters

Carpenters Day
lisp

Lisp Day
cuddle up

Cuddle Up Day
boy friend

Boy Friend Day
comfy

Comfy Day
me

Me Day
bounce

Bounce Day
mean girls

Mean Girls Day
bow tie

Bow Tie Day
ask out your crush

Ask Out Your Crush Day