1. In 1886, the famous gunfight at O.K. Corral took place in Tombstone, Arizona. While the actual gunfight occurred on October 26, April 22 is the birthday of Wyatt Earp, one of the famous lawmen involved in the fight.

2. In 1909, Quince A. Perry became the first elected mayor of Phoenix, Arizona. Perry served as mayor until 1912 and was instrumental in securing important government contracts that helped boost the city's economy.

3. On April 22, 1940, Flagstaff High School's orchestra and choir performed at the New York World's Fair. The group performed several songs, including a rendition of "The Star-Spangled Banner" that drew widespread praise.

4. In 1970, the first Earth Day was celebrated across the United States. In Arizona, several events were held to mark the occasion, including a rally at the State Capitol and a day-long teach-in at Arizona State University.

5. On April 22, 1996, the Mesa Convention Center opened its doors for the first time. The center, which covers over 170,000 square feet, has since hosted numerous events, including concerts, trade shows, conventions, and sporting events.