Oops, it doesn't look like 'wank off with your mates day' is a national day..

Other days

Raise Awerness Of Zeus Day

Prosecco Day

Frozen Yogurt Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Polyamory Day

Lumpy Rug Day

Slime Day

Chocolate Milkshake Day

Lisp Day

Comfy Day