Oops, it doesn't look like 'mall shutters some museums for rest of day' is a national day..

Other days

Ask Out Your Crush Day

Coffee Day

Cursing Day

Appreciate Yaself A Lil Extra Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Kiss A Ginger Day

Blanket Fort Day

Hoodie Day

Tulip Day

Lost Sock Memorial Day