1. On August 28, 1928, the Hoover Dam was dedicated by President Herbert Hoover. The dam greatly increased the water supply in Arizona and provided hydroelectric power to the state.

2. In 1963, the University of Arizona officially opened the Lunar and Planetary Laboratory, which has since played a significant role in NASA's space exploration programs.

3. On August 28, 1953, the Phoenix Symphony Orchestra was founded. It has since become one of the state's leading cultural institutions and regularly performs at Symphony Hall in downtown Phoenix.

4. In 1996, the Grand Canyon National Park was designated as a World Heritage site by UNESCO. The park attracts millions of visitors each year and is one of Arizona's most popular tourist destinations.

5. On August 28, 1914, the Arizona State Fair was founded, which has since grown to become one of the state's largest annual events. The fair features carnival rides, live music, agricultural exhibits, and more.