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

Other days

buddy

Buddy Day
bubble bath

Bubble Bath Day
hoodie

Hoodie Day
first love

First Love Day
blanket fort

Blanket Fort Day
emoji

Emoji Day
coffee

Coffee Day
nae nae

Nae Nae Day
tell a fairytale

Tell A Fairytale Day
boy friend

Boy Friend Day