1. On November 20, 1948, the University of Denver Pioneers football team played in their first bowl game, the Oil Bowl in Houston, Texas. They defeated the Texas Western College Miners with a score of 35-0.

2. In 1968, the United States suffered a tragedy when a plane carrying the Wichita State University football team crashed into a mountain near Silver Plume, Colorado on November 20. The crash killed 31 people, including 14 members of the football team.

3. November 20, 1985, marked the opening of Colorado's first gambling town, Black Hawk. The town was previously a desolate mining town but was transformed into a booming gambling town after Colorado legalized limited stakes gaming.

4. On November 20, 1999, the Colorado State Rams football team clinched its third straight Western Athletic Conference (WAC) title with a 41-21 victory over the Air Force Falcons.

5. In 2018, Rocky Mountain National Park celebrated its 100th anniversary on November 20. The park, which spans over 415 square miles, is home to various forms of wildlife, including elk, deer, and bighorn sheep. It is also known for its picturesque scenery, with towering mountains, crystal-clear lakes, and alpine forests.