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

Other days

fiancee

Fiancee Day
cursing

Cursing Day
bow tie

Bow Tie Day
offer

Offer Day
blanket fort

Blanket Fort Day
one

One Day
lisp

Lisp Day
tell a fairytale

Tell A Fairytale Day
stud

Stud Day
ponytail

Ponytail Day