Oops, it doesn't look like 'park for free as part of public lands day' is a national day..

Other days

Prescription Drug Take Back Day

Bubble Bath Day

My Little Pony Day

Unicorn Day

Bonang Day

Camera Day

Ask Out Your Crush Day

Tell Ur Crush You Like Them Day

Healing Day

African Immigrant And Refugee Hiv And Hep Awareness Day