Oops, it doesn't look like 'Best Friend Bff day' is a national day..

Other days

tulip

Tulip Day
bow tie

Bow Tie Day
pumpkin

Pumpkin Day
me

Me Day
camera

Camera Day
blanket fort

Blanket Fort Day
kale

Kale Day
bounce

Bounce Day
cuddle up

Cuddle Up Day
law

Law Day