Oops, it doesn't look like 'nasty ass aftertaste in your mouth diet soda day' is a national day..

Other days

Stress Awareness Day

Boyfriend Day

Fiancee Day

Tell Ur Crush You Like Them Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Ponytail Day

Lash Day

Lumpy Rug Day

Prescription Drug Take Back Day

Offer Day