Oops, it doesn't look like 'wash ya ass day' is a national day..

Other days

tulip

Tulip Day
nail polish

Nail Polish Day
offer

Offer Day
unicorn

Unicorn Day
self care

Self Care Day
ride the wind

Ride The Wind Day
singles

Singles Day
camera

Camera Day
comfy

Comfy Day
nae nae

Nae Nae Day