Oops, it doesn't look like 'late best friends day' is a national day..

Other days

believe

Believe Day
camera

Camera Day
law

Law Day
kale

Kale Day
mean girls

Mean Girls Day
brow

Brow Day
cuddle up

Cuddle Up Day
hoodie

Hoodie Day
girl friend

Girl Friend Day
kiss a ginger

Kiss A Ginger Day