Oops, it doesn't look like 'museum of the united states army as they celebrate opening day' is a national day..

Other days

Self Appreciation Day

Martini Day

Stress Awareness Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Lost Sock Memorial Day

Kiss A Ginger Day

Bonang Day

Pampering Day

Kiss A Brunette Day

Pick Me Day