Oops, it doesn't look like 'and state parks are a great place to spend memorial day' is a national day..

Other days

Healing Day

Chocolate Milkshake Day

Bubble Bath Day

Blanket Fort Day

Lumpy Rug Day

Bounce Day

Special Education Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Raise Awerness Of Zeus Day

Ponytail Day