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

Other days

stud

Stud Day
lumpy rug

Lumpy Rug Day
tulip

Tulip Day
nae nae

Nae Nae Day
ruby

Ruby Day
one

One Day
prosecco

Prosecco Day
girl friend

Girl Friend Day
cat girl

Cat Girl Day
tell a fairytale

Tell A Fairytale Day