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

Other days

ruby

Ruby Day
gum

Gum Day
ask out your crush

Ask Out Your Crush Day
kale

Kale Day
get funky

Get Funky Day
me

Me Day
china

China Day
pumpkin

Pumpkin Day
polyamory

Polyamory Day
frozen yogurt

Frozen Yogurt Day