Earth Day — Coloring and Zentangle pages and drawing with pattern. A unique activity for Earth Day. Great for sub plan, intro to lesson, early finisher, bell ringer etc. Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) including 1 billion people in more than 193 countries.