Oops, it doesn't look like 'genocide of native americans day' is a national day..

Other days

fiancee

Fiancee Day
brow

Brow Day
stud

Stud Day
donate your hair

Donate Your Hair Day
one

One Day
self care

Self Care Day
hannah

Hannah Day
ruby

Ruby Day
lisp

Lisp Day
polyamory

Polyamory Day