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

Other days

china

China Day
kiss a brunette

Kiss A Brunette Day
buddy

Buddy Day
my little pony

My Little Pony Day
cursing

Cursing Day
gum

Gum Day
brow

Brow Day
nae nae

Nae Nae Day
comfy

Comfy Day
polyamory

Polyamory Day