Oops, it doesn't look like 'historic site celebrates artillery day' is a national day..

Other days

Kale Day

Chocolate Milkshake Day

Pumpkin Day

Frozen Yogurt Day

Latina Equal Pay Day

Me Day

Appreciate Yaself A Lil Extra Day

Hoodie Day

Self Appreciation Day

African Immigrant And Refugee Hiv And Hep Awareness Day