1. On October 26, 1864, a tragic event known as the Sand Creek Massacre occurred in Colorado. A group of Colorado militia attacked a peaceful Cheyenne and Arapaho tribe camped along Sand Creek, killing over 150 people, mostly women, children, and elderly.

2. On October 26, 1931, the completion of the first section of the Colorado River Aqueduct was celebrated with a grand ceremony in San Bernardino, California. The aqueduct stretches 242 miles from the Colorado River to serve the water needs of Southern California.

3. October 26, 1951 saw the opening of the United States Air Force Academy in Colorado Springs. The academy serves as an institution of higher learning and military training for the next generation of Air Force officers.

4. In 1984, on October 26, the first-ever Great American Beer Festival was held in Denver, Colorado, attracting just 22 breweries. Today, the festival has become the largest beer festival in the world, with over 800 breweries and 4,000 types of beer.

5. On October 26, 2019, the city of Boulder, Colorado, launched a pilot food waste recycling program, becoming the first city in the state to do so. The program allowed residents to dispose of their food waste in green carts, which would then be collected and converted into compost.