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

Other days

ponytail

Ponytail Day
coffee

Coffee Day
healing

Healing Day
boyfriend

Boyfriend Day
mean girls

Mean Girls Day
aloxolt

Aloxolt Day
lumpy rug

Lumpy Rug Day
gum

Gum Day
stud

Stud Day
ruby

Ruby Day