Oops, it doesn't look like 'break your diet day' is a national day..

Other days

Nae Nae Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Nail Polish Day

Azonto Is Acceptable Day

Donate Your Hair Day

Pumpkin Day

My Little Pony Day

Boba Day

Kiss A Brunette Day

Kiss A Ginger Day