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

Other days

youth

Youth Day
nail polish

Nail Polish Day
hot chocolate

Hot Chocolate Day
mean girls

Mean Girls Day
gum

Gum Day
raise awerness of zeus

Raise Awerness Of Zeus Day
book

Book Day
lisp

Lisp Day
tulip

Tulip Day
ruby

Ruby Day