CppCon moved to Denver, Colorado (technically Aurora, CO) just a few miles from Denver Airport. 1400 people attended from Sept 16-20 and a 150 talks over the 5 days. Additionally, there were 1 and 2 day training classes the weekends before and after the conference.
The Gaylord Rocky Mountain Resort hosted CppCon. It’s a huge place that’s very conference oriented though there are some nice pools and rec areas. You are pretty isolated so plan on eating at the nice but overpriced restaurants.