America’s largest community service festival, which started in 1999 as Temple Israel of Hollywood Mitzvah Day, attracts nearly 50,000 people from every neighborhood, race, religion, ethnicity and socioeconomic group to hundreds of projects in communities across Southern California. Volunteer projects include such activities as planting gardens at schools, fixing up homeless shelters and sprucing up dog parks. Big Sunday Weekend also features concerts, book fairs and blood drives. Fri. Through May 5. Various times. Free. Various locations. (323) 549-9944.