Oops, it doesn't look like 'cass appreciation day' is a national day..

Other days

camera

Camera Day
lumpy rug

Lumpy Rug Day
artists

Artists Day
unicorn

Unicorn Day
kiss a brunette

Kiss A Brunette Day
stress awareness

Stress Awareness Day
lost sock memorial

Lost Sock Memorial Day
bow tie

Bow Tie Day
blanket fort

Blanket Fort Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day