Earth Day is celebrated annually on April 22nd to promote environmental protection and stewardship of the Earth. It began in the United States in 1970 and now includes events in over 190 countries. While there is no central organization, several non-governmental organizations help coordinate thousands of local events like cleanups, educational activities, and environmental advocacy events to mark Earth Day and inspire further action to care for the planet. The document provides examples of activities individuals and community groups can organize for Earth Day celebrations or environmental awareness events throughout the year.