Oops, it doesn't look like 'have a coca cola day' is a national day..

Other days

frozen yogurt

Frozen Yogurt Day
believe

Believe Day
bubble bath

Bubble Bath Day
special education

Special Education Day
boy friend

Boy Friend Day
lisp

Lisp Day
hiv awareness

Hiv Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
azonto is acceptable

Azonto Is Acceptable Day
kiss a ginger

Kiss A Ginger Day