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

Other days

lisp

Lisp Day
bubble bath

Bubble Bath Day
brow

Brow Day
stud

Stud Day
believe

Believe Day
comfy

Comfy Day
cuddle up

Cuddle Up Day
eat what you want

Eat What You Want Day
boy friend

Boy Friend Day
donate your hair

Donate Your Hair Day