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

Other days

martini

Martini Day
boy friend

Boy Friend Day
special education

Special Education Day
stud

Stud Day
singles

Singles Day
kale

Kale Day
cuddle up

Cuddle Up Day
bounce

Bounce Day
law

Law Day
lumpy rug

Lumpy Rug Day