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

Other days

kale

Kale Day
ruby

Ruby Day
donate your hair

Donate Your Hair Day
bubble bath

Bubble Bath Day
girl friend

Girl Friend Day
tulip

Tulip Day
nae nae

Nae Nae Day
ormille

Ormille Day
one

One Day
tell a fairytale

Tell A Fairytale Day