Oops, it doesn't look like 'Park Grounds Same day' is a national day..

Other days

law

Law Day
gum

Gum Day
kale

Kale Day
latina equal pay

Latina Equal Pay Day
ride the wind

Ride The Wind Day
promposal

Promposal Day
brow

Brow Day
cursing

Cursing Day
tulip

Tulip Day
ruby

Ruby Day