The Great Class of 1976 decided to undertake a climb of Mount Princeton, Colorado, as part of the run-up to our 40th reunion. It was decided that the best time to do this was at the end of summer in September 2015. At this time of year, mountain weather is least susceptible to storms: either thunderstorms or snowstorms. Most of the climbers arrived in Colorado a day or two beforehand, in order to acclimate to the high altitude and thus reduce the chance of experiencing altitude sickness during the climb.