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

Other days

ruby

Ruby Day
kale

Kale Day
book

Book Day
boy friend

Boy Friend Day
kiss a ginger

Kiss A Ginger Day
ride the wind

Ride The Wind Day
donate your hair

Donate Your Hair Day
ask out your crush

Ask Out Your Crush Day
me

Me Day
stud

Stud Day