1. On December 24, 1865, the first ever Wyoming Territorial Legislature convened in Cheyenne, marking a significant moment in the region's history. This legislative body was responsible for setting up the new territory's government and establishing laws and regulations to govern the vast, sparsely populated land.

2. December 24, 1888 saw the opening of the first railroad line in the town of Sheridan, connecting it to the rest of the country and revolutionizing transportation in the region. This railroad line played a critical role in the growth and development of Sheridan and the surrounding area, spurring economic growth and connecting the town to national markets.

3. December 24, 1890 marked the tragic end of the Wounded Knee Massacre, in which over 150 Lakota Sioux were killed by US soldiers in South Dakota. This event had a profound impact on the Native American community, shaping their views of the United States government and fueling long-standing struggles for justice and recognition.

4. In 1913, the University of Wyoming's brand-new gymnasium was dedicated on December 24th, marking an important moment in the development of the state's premier institution of higher education. Over the years, the gymnasium (now known as the Arena-Auditorium) has hosted countless sporting events, concerts, and other activities, becoming a beloved symbol of Wyoming pride.

5. Finally, on December 24, 1979, the Governor of Wyoming issued a special proclamation designating the day as "Wyoming Boy Scout Day". This recognition was in honor of the many contributions that the Boy Scouts had made to the state and its communities, and helped to highlight the important role that youth organizations play in shaping the future of Wyoming and the nation as a whole.