Oops, it doesn't look like 'self harm in history day' is a national day..

Other days

Polyamory Day

Lumpy Rug Day

Martini Day

Hoodie Day

Aloxolt Day

Appreciate Yaself A Lil Extra Day

Tell Ur Crush You Like Them Day

Donate Your Hair Day

Ponytail Day

Raise Awerness Of Zeus Day