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

Other days

pumpkin

Pumpkin Day
eat what you want

Eat What You Want Day
one

One Day
blanket fort

Blanket Fort Day
lumpy rug

Lumpy Rug Day
law

Law Day
hannah

Hannah Day
frozen yogurt

Frozen Yogurt Day
pick me

Pick Me Day
ponytail

Ponytail Day