Oops, it doesn't look like 'irrelevant old fucks day' is a national day..

Other days

stud

Stud Day
nail polish

Nail Polish Day
ride the wind

Ride The Wind Day
one

One Day
bow tie

Bow Tie Day
brow

Brow Day
china

China Day
cuddle up

Cuddle Up Day
nae nae

Nae Nae Day
camera

Camera Day