Oops, it doesn't look like 'parks on the last day' is a national day..

Other days

bounce

Bounce Day
hoodie

Hoodie Day
mean girls

Mean Girls Day
cursing

Cursing Day
lash

Lash Day
youth

Youth Day
blanket fort

Blanket Fort Day
stud

Stud Day
fiancee

Fiancee Day
get funky

Get Funky Day