1. On July 12, 1858, William Greeneberry Russell and his party discovered gold on the South Platte River, leading to the Pike's Peak Gold Rush and the settlement of many mining towns in Colorado.

2. On July 12, 1876, a group of outlaws led by "Wild" Bill Hickok robbed the First National Bank in Central City, Colorado, making off with $20,000 in gold coins. They were eventually caught and brought to trial.

3. On July 12, 1892, the Great Fire of Denver destroyed much of the downtown area, burning over 60 buildings and causing $10 million in damages. Over 5,000 people were left homeless.

4. On July 12, 1932, the Denver Post sponsored a mock trial of the new Deal policies of President Franklin D. Roosevelt at Red Rocks Amphitheatre. Over 30,000 people attended the event, which featured prominent politicians and businessmen.

5. On July 12, 1976, Colorado celebrated its centennial as a state with a week-long celebration, featuring parades, concerts, and other events. The festivities culminated in a grand fireworks display over Denver.