1. Earth Day was first observed in California on April 22, 1970. The day was created by U.S. Senator Gaylord Nelson to raise awareness about environmental issues and promote conservation efforts.

2. On April 22, 1889, the Oklahoma Land Rush began. Thousands of settlers rushed into the newly opened territory to claim land. Many California residents joined the rush, hoping to find new opportunities and a fresh start.

3. On April 22, 1964, a 9.2-magnitude earthquake struck Alaska, causing a tsunami that devastated coastal communities in California. The wave caused extensive damage and claimed the lives of several local residents.

4. In 1990, the California Coastal Commission introduced a new plan to protect the state's coastal resources. The Coastal Act, which was signed into law on April 22 of that year, established guidelines for development and conservation along the coast.

5. On April 22, 2015, the iconic California 'super bloom' took place in the Antelope Valley Poppy Reserve. The event was caused by an unusually wet winter, which resulted in a spectacular display of wildflowers that drew thousands of visitors to the reserve.