• The Altamont Free Concert is held at the Altamont Speedway between Tracy and Livermore
• Advanced Micro Devices is founded in Sunnyvale
• American Zoetrope (headquarters at the Sentinal Building pictured) is founded in San Francisco by Francis Ford Coppola
• The Exploratorium (interior pictured) is founded in San Francisco
• Clothing retailer The Gap (early logo pictured) is founded in San Francisco
• The Oakland Museum of California is established
• The San Jose Museum of Art (pictured) is established
• A "People's Park" (pictured) is created by community activists on University of California, Berkeley property, off Telegraph Avenue in Berkeley
• The Bank of America Center building in San Francisco is completed
• The Occupation of Alcatraz by Native American activists begins
• Earth Day is first proposed by John McConnell at a UNESCO conference in San Francisco