Oops, it doesn't look like 'run it up the flagpole and see if anyone salutes day' is a national day..

Other days

Lisp Day

Kiss A Ginger Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Tell A Fairytale Day

My Little Pony Day

Self Care Day

Boba Day

China Day

Hannah Day

Raise Awerness Of Zeus Day