on june 2, 2006, the second green friday between noon and 12:30 hybrid cars in palm springs are asked to gather and drive in parade formation through downtown with lights on
a day set aside to protect the environment and help stop global warming by getting out of cars and using alternatives such as bicycles, walking, buses and carpools
"on june 2, 2006, the second green friday between noon and 12:30 hybrid cars in palm springs are asked to gather and drive in parade formation through downtown with lights on" What is the definition of "green friday"?