Oops, it doesn't look like 'waterpark milk chocolate hamburger day' is a national day..

Other days

Donate Your Hair Day

Stress Awareness Day

Gum Day

Frozen Yogurt Day

Latina Equal Pay Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Self Appreciation Day

Appreciate Yaself A Lil Extra Day

Lumpy Rug Day

Tulip Day