Oops, it doesn't look like 'super hero super hero day' is a national day..

Other days

Prosecco Day

Embarrass Your Best Friend Day

Nae Nae Day

Boba Day

Eat What You Want Day

Slime Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Carpenters Day

Hiv Awareness Day

Brow Day