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

Other days

comfy

Comfy Day
stud

Stud Day
lisp

Lisp Day
mean girls

Mean Girls Day
ask out your crush

Ask Out Your Crush Day
lash

Lash Day
brow

Brow Day
boyfriend

Boyfriend Day
ruby

Ruby Day
girl friend

Girl Friend Day