1. In 1888, Wyoming held its first ever statewide Republican convention in Cheyenne on May 21. The convention was held in order to nominate candidates for the upcoming elections.
2. On May 21, 1904, the first passenger train arrived in Lusk, Wyoming. This was a significant event for the small town, as it allowed for easier transportation and access to goods and services.
3. In 1947, a tornado hit the city of Wheatland, Wyoming on May 21. The tornado caused extensive damage and resulted in the deaths of two people, while injuring several others.
4. On May 21, 1955, the Wyoming State Capitol building in Cheyenne was officially opened to the public. The building had undergone extensive renovations and improvements, and was celebrated with a grand opening ceremony.
5. The University of Wyoming held its Spring Commencement ceremony on May 21, 2011. The ceremony saw a record-breaking number of graduates, with over 1,800 students receiving their degrees. The keynote speaker for the event was Cynthia Hogan, a former chief counsel for the US Senate Judiciary Committee.