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

Other days

slime

Slime Day
artists

Artists Day
coffee

Coffee Day
cursing

Cursing Day
tell a fairytale

Tell A Fairytale Day
hoodie

Hoodie Day
ormille

Ormille Day
tulip

Tulip Day
bow tie

Bow Tie Day
blanket fort

Blanket Fort Day