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

Other days

stud

Stud Day
gum

Gum Day
my little pony

My Little Pony Day
lisp

Lisp Day
polyamory

Polyamory Day
prosecco

Prosecco Day
tulip

Tulip Day
cat girl

Cat Girl Day
nae nae

Nae Nae Day
hiv awareness

Hiv Awareness Day