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

Other days

tulip

Tulip Day
believe

Believe Day
first love

First Love Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
lisp

Lisp Day
ponytail

Ponytail Day
tell a fairytale

Tell A Fairytale Day
self care

Self Care Day
slime

Slime Day
eat what you want

Eat What You Want Day