1. On May 23, 1868, the Transcontinental Railroad was completed in Promontory Summit, Utah. The Central Pacific Railroad and the Union Pacific Railroad were joined with a golden spike, which marked the completion of the first railroad across the United States.

2. On May 23, 1922, the Great Salt Lake Marina was officially opened. It is the largest marina in the state of Utah and is used for boating, fishing, and other water activities.

3. On May 23, 1970, the University of Utah riots occurred. Students at the university were protesting the killing of four students at Kent State University earlier that month. The protest turned violent and resulted in the National Guard being called in to disperse the crowds.

4. On May 23, 1995, the Salt Lake City International Airport was officially dedicated. The airport is the largest in the state of Utah and serves as a hub for several major airlines.

5. On May 23, 2021, the Salt Lake Bees played their first game in over 600 days due to the COVID-19 pandemic. The Bees are the Triple-A affiliate of the Los Angeles Angels and play their home games at Smith's Ballpark in Salt Lake City.