Oops, it doesn't look like 'power of a smile day' is a national day..

Other days

cuddle up

Cuddle Up Day
pick me

Pick Me Day
nae nae

Nae Nae Day
singles

Singles Day
lisp

Lisp Day
first love

First Love Day
ruby

Ruby Day
tulip

Tulip Day
one

One Day
donate your hair

Donate Your Hair Day