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

Other days

fiancee

Fiancee Day
bounce

Bounce Day
bow tie

Bow Tie Day
lisp

Lisp Day
singles

Singles Day
my little pony

My Little Pony Day
gallery

Gallery Day
artists

Artists Day
stud

Stud Day
brow

Brow Day