Oops, it doesn't look like 'parkgood morning and happy hump day' is a national day..

Other days

Pumpkin Day

Nail Polish Day

Bow Tie Day

Donate Your Hair Day

Eat What You Want Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Slime Day

Book Day

Kiss A Brunette Day

Raise Awerness Of Zeus Day