Oops, it doesn't look like 'and state parks are a great place to spend memorial day' is a national day..

Other days

Ruby Day

Tell Ur Crush You Like Them Day

Martini Day

Lumpy Rug Day

One Day

Chocolate Milkshake Day

Tell A Fairytale Day

Hiv Awareness Day

Embarrass Your Best Friend Day

Fiancee Day