Exhibitors from all over Los Angeles County and Ventura County will be participating in the event to help residents learn more about local programs and initiatives. Calabasas Earth Day/Green Expo was created to be a day of education, celebration, and action for the natural world in which we live. On April 22, 1970, Earth Day marked the beginning of the modern environmental movement. Calabasas Earth Day/Green Expo encourages people and businesses to make simple lifestyle changes to help the environment and promote sustainability.