1. In 1853, California's first college, Santa Clara College (now Santa Clara University), was founded on October 31st. It was established by a group of Jesuit priests and is still in operation today.

2. On October 31, 1881, the famous Gunfight at the O.K. Corral took place in Tombstone, Arizona, just over the California border. The shootout involved Wyatt Earp, his brothers, and Doc Holliday, and is considered to be one of the Wild West's most infamous events.

3. In 1938, on Halloween night, Orson Welles' radio adaptation of H.G. Wells' "War of the Worlds" caused widespread panic in California and across the country. Many listeners believed that the dramatic news broadcast was real, and thousands of people panicked in the streets.

4. October 31, 1953, marks the day when the construction of Disneyland began in Anaheim, California. This world famous amusement park officially opened to the public in 1955 and has continued to attract millions of visitors each year.

5. On October 31, 2003, the San Francisco Giants played in their first-ever World Series game. They faced off against the Anaheim Angels in Game 3, ultimately losing 10-4. The Giants went on to win Game 5 but fell short in Game 7, ending their championship dreams.