Oops, it doesn't look like 'super hero super hero day' is a national day..

Other days

gum

Gum Day
first love

First Love Day
prosecco

Prosecco Day
brow

Brow Day
bubble bath

Bubble Bath Day
ruby

Ruby Day
law

Law Day
hoodie

Hoodie Day
pampering

Pampering Day
one

One Day