1. The California Golden Gate International Exposition opened on May 30, 1939. The exposition was held on Treasure Island in San Francisco Bay and celebrated the completion of both the Bay Bridge and Golden Gate Bridge.

2. The first California State Archaeological Landmark was designated on May 30, 1956. The landmark recognized the importance of the La Brea Tar Pits in Los Angeles, which contain millions of fossils and have provided valuable insights into prehistoric life in the region.

3. On May 30, 1924, the iconic Hollywood sign was officially dedicated. Originally spelling out "Hollywoodland," the sign was erected as a real estate advertisement and has since become a symbol of the entertainment industry.

4. In 1862, John Muir arrived in Yosemite for the first time on May 30. Muir is known as the "Father of the National Parks" and his efforts to preserve wilderness areas led to the founding of the National Park Service.

5. The University of California, Santa Barbara was established on May 30, 1909. The university has since become a top-ranked institution and is known for its research in fields such as marine science and environmental studies.