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

Other days

offer

Offer Day
bubble bath

Bubble Bath Day
artists

Artists Day
get funky

Get Funky Day
lisp

Lisp Day
girl friend

Girl Friend Day
buddy

Buddy Day
carpenters

Carpenters Day
ride the wind

Ride The Wind Day
hannah

Hannah Day