Oops, it doesn't look like 'school sport week and we are encouraging everyone to join in and create their own sports day' is a national day..

Other days

Lisp Day

Tell Ur Crush You Like Them Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Book Day

Chocolate Milkshake Day

Girl Friend Day

Donate Your Hair Day

Polyamory Day

Mean Girls Day

Coffee Day