Oops, it doesn't look like 'parks in washington in same day' is a national day..

Other days

Appreciate Yaself A Lil Extra Day

Ride The Wind Day

Slime Day

Bow Tie Day

Ormille Day

Bonang Day

Gum Day

Lumpy Rug Day

My Little Pony Day

African Immigrant And Refugee Hiv And Hep Awareness Day