Oops, it doesn't look like 'parks at night day' is a national day..

Other days

unicorn

Unicorn Day
kiss a brunette

Kiss A Brunette Day
bounce

Bounce Day
gum

Gum Day
cursing

Cursing Day
pumpkin

Pumpkin Day
pampering

Pampering Day
get funky

Get Funky Day
hoodie

Hoodie Day
ruby

Ruby Day