Oops, it doesn't look like 'flip flop day day' is a national day..

Other days

Nail Polish Day

Buddy Day

Nae Nae Day

Appreciate Yaself A Lil Extra Day

Hoodie Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Special Education Day

Prosecco Day

Tell A Fairytale Day

Ponytail Day