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

Other days

bubble bath

Bubble Bath Day
ponytail

Ponytail Day
pick me

Pick Me Day
eat what you want

Eat What You Want Day
one

One Day
lumpy rug

Lumpy Rug Day
bounce

Bounce Day
hoodie

Hoodie Day
artists

Artists Day
unicorn

Unicorn Day