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

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
pumpkin

Pumpkin Day
polyamory

Polyamory Day
bow tie

Bow Tie Day
ask out your crush

Ask Out Your Crush Day
unicorn

Unicorn Day
prescription drug take back

Prescription Drug Take Back Day
camera

Camera Day
self care

Self Care Day
self appreciation

Self Appreciation Day