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

Other days

bubble bath

Bubble Bath Day
gum

Gum Day
kale

Kale Day
tell a fairytale

Tell A Fairytale Day
bounce

Bounce Day
law

Law Day
aloxolt

Aloxolt Day
bow tie

Bow Tie Day
first love

First Love Day
ormille

Ormille Day