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

Other days

prosecco

Prosecco Day
self appreciation

Self Appreciation Day
lisp

Lisp Day
girl friend

Girl Friend Day
gum

Gum Day
believe

Believe Day
fiancee

Fiancee Day
bonang

Bonang Day
cursing

Cursing Day
one

One Day