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

Other days

lash

Lash Day
comfy

Comfy Day
bow tie

Bow Tie Day
brow

Brow Day
cat girl

Cat Girl Day
hannah

Hannah Day
kiss a ginger

Kiss A Ginger Day
offer

Offer Day
girl friend

Girl Friend Day
slime

Slime Day