Oops, it doesn't look like 'joke or a disgrace depending on the day' is a national day..

Other days

African Immigrant And Refugee Hiv And Hep Awareness Day

Offer Day

Slime Day

Chocolate Milkshake Day

Boy Friend Day

Lash Day

Prosecco Day

Kiss A Brunette Day

Carpenters Day

Lumpy Rug Day