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

Other days

African Immigrant And Refugee Hiv And Hep Awareness Day

Hiv Awareness Day

Gum Day

My Little Pony Day

Nae Nae Day

Lisp Day

Azonto Is Acceptable Day

Lumpy Rug Day

Ask Out Your Crush Day

Stud Day