Oops, it doesn't look like 'organizer of the first earth day' is a national day..

Other days

Hot Chocolate Day

Ride The Wind Day

Chocolate Milkshake Day

Kiss A Brunette Day

Believe Day

Cursing Day

Aloxolt Day

Ponytail Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Embarrass Your Best Friend Day