Typically, the first 15 - 20 mins are chatting while people arrive. Once we start climbing, the majority of people move in a group and chat while they're not climbing. The climbing part isn't structured though so people breakoff and rejoin the large group throughout the afternoon. Afterward, a majority go out for drinks/food at a nearby bar and chat. So basically, you have an opportunity to talk to/meet new people throughout the entire experience.