Oops, it doesn't look like 'park was forced to delete factual tweets about the environment cause they made the president mad happy day' is a national day..

Other days

Artists Day

Brow Day

Hoodie Day

Eat What You Want Day

Reading Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Law Day

Coffee Day

Kiss A Brunette Day

Raise Awerness Of Zeus Day