Oops, it doesn't look like 'sepanx day' is a national day..

Other days

mean girls

Mean Girls Day
law

Law Day
carpenters

Carpenters Day
bow tie

Bow Tie Day
hoodie

Hoodie Day
believe

Believe Day
eat what you want

Eat What You Want Day
camera

Camera Day
polyamory

Polyamory Day
buddy

Buddy Day