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

Other days

one

One Day
stud

Stud Day
pick me

Pick Me Day
kale

Kale Day
kiss a brunette

Kiss A Brunette Day
my little pony

My Little Pony Day
nae nae

Nae Nae Day
blanket fort

Blanket Fort Day
gum

Gum Day
china

China Day