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

Other days

first love

First Love Day
stress awareness

Stress Awareness Day
ruby

Ruby Day
singles

Singles Day
bonang

Bonang Day
stud

Stud Day
cursing

Cursing Day
hannah

Hannah Day
lisp

Lisp Day
nae nae

Nae Nae Day