Oops, it doesn't look like 'park service in celebrating aviation day' is a national day..

Other days

Youth Day

Ask Out Your Crush Day

My Little Pony Day

Gum Day

Ormille Day

Chocolate Milkshake Day

Healing Day

Pumpkin Day

Appreciate Yaself A Lil Extra Day

African Immigrant And Refugee Hiv And Hep Awareness Day