Oops, it doesn't look like 'park for a fee free day' is a national day..

Other days

lisp

Lisp Day
get funky

Get Funky Day
gallery

Gallery Day
china

China Day
offer

Offer Day
law

Law Day
hoodie

Hoodie Day
kiss a brunette

Kiss A Brunette Day
self care

Self Care Day
ponytail

Ponytail Day