Oops, it doesn't look like 'pay only with cash day' is a national day..

Other days

Appreciate Yaself A Lil Extra Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Offer Day

Cat Girl Day

Carpenters Day

Pumpkin Day

Ask Out Your Crush Day

Kiss A Ginger Day

Kiss A Brunette Day

Boyfriend Day