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

Other days

healing

Healing Day
lash

Lash Day
stud

Stud Day
self appreciation

Self Appreciation Day
brow

Brow Day
ponytail

Ponytail Day
lisp

Lisp Day
singles

Singles Day
bow tie

Bow Tie Day
offer

Offer Day