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

Other days

gum

Gum Day
reading

Reading Day
blanket fort

Blanket Fort Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
my little pony

My Little Pony Day
tell a fairytale

Tell A Fairytale Day
artists

Artists Day
bow tie

Bow Tie Day
frozen yogurt

Frozen Yogurt Day
believe

Believe Day