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

Other days

one

One Day
ponytail

Ponytail Day
kiss a brunette

Kiss A Brunette Day
get funky

Get Funky Day
blanket fort

Blanket Fort Day
self care

Self Care Day
tulip

Tulip Day
buddy

Buddy Day
camera

Camera Day
stud

Stud Day