1. On September 7, 1858, William Green Russell and his group discovered gold at the confluence of the South Platte River and Cherry Creek, which led to the Pike's Peak Gold Rush and the establishment of Denver.

2. In 1921, the Colorado State Fair opened on September 7 in Pueblo. The fair has since become an annual event, featuring carnival rides, agricultural exhibits, live music, and a variety of competitions.

3. On September 7, 1941, the U.S. Army established the Camp Hale training facility in the White River National Forest near Leadville, Colorado. The camp was home to the famous 10th Mountain Division, which played a crucial role in the Italian campaign of World War II.

4. The University of Colorado Boulder was founded on September 7, 1876, just two months before Colorado became a state. Today, the university is one of the most prestigious and respected public research universities in the country.

5. On September 7, 1984, the Denver Broncos played their first regular season game at Mile High Stadium, which would become the team's home for the next 32 years. The Broncos won the game 20-16 over the Pittsburgh Steelers.