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

Other days

buddy

Buddy Day
nae nae

Nae Nae Day
unicorn

Unicorn Day
self care

Self Care Day
nail polish

Nail Polish Day
offer

Offer Day
polyamory

Polyamory Day
first love

First Love Day
girl friend

Girl Friend Day
gum

Gum Day