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

Other days

artists

Artists Day
boy friend

Boy Friend Day
buddy

Buddy Day
my little pony

My Little Pony Day
self appreciation

Self Appreciation Day
kale

Kale Day
pumpkin

Pumpkin Day
ruby

Ruby Day
law

Law Day
kiss a ginger

Kiss A Ginger Day