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

Other days

boyfriend

Boyfriend Day
get funky

Get Funky Day
carpenters

Carpenters Day
singles

Singles Day
lisp

Lisp Day
ride the wind

Ride The Wind Day
donate your hair

Donate Your Hair Day
artists

Artists Day
stud

Stud Day
boy friend

Boy Friend Day