1. On November 27, 1927, the historic Grauman's Chinese Theatre opened in Hollywood, California. The theater was designed by architect Raymond M. Kennedy and built by showman Sid Grauman, and quickly became a popular destination for movie premieres and red carpet events.

2. In 1978, San Francisco Mayor George Moscone and Supervisor Harvey Milk were assassinated at San Francisco City Hall on November 27 by former Supervisor Dan White. The murders sparked national outrage and had a lasting impact on the LGBTQ+ rights movement.

3. The San Francisco-Oakland Bay Bridge opened to traffic on November 27, 1936, connecting the two cities and providing an important transportation link between San Francisco and the East Bay.

4. On November 27, 1941, the Japanese Imperial Navy launched a surprise attack on the U.S. Navy base at Pearl Harbor, Hawaii, marking the beginning of U.S. involvement in World War II. California played a major role in the war effort, with many military bases and defense industries located throughout the state.

5. In 1973, the world's first successful in vitro fertilization (IVF) procedure was performed at the University of Southern California Medical Center in Los Angeles, marking a major breakthrough in reproductive medicine. The procedure eventually led to the birth of the first "test tube baby" in 1978.