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

Other days

kale

Kale Day
brow

Brow Day
ride the wind

Ride The Wind Day
get funky

Get Funky Day
comfy

Comfy Day
gum

Gum Day
cursing

Cursing Day
my little pony

My Little Pony Day
lisp

Lisp Day
boy friend

Boy Friend Day