Oops, it doesn't look like 'average on date day' is a national day..

Other days

comfy

Comfy Day
bow tie

Bow Tie Day
nail polish

Nail Polish Day
eat what you want

Eat What You Want Day
hannah

Hannah Day
hoodie

Hoodie Day
pampering

Pampering Day
one

One Day
offer

Offer Day
slime

Slime Day