What Creates Comfortable Private and Social Gatherings?

A group of people gathers for a weekend trip. Some members laugh and talk freely. Others stay quiet near the edge of the room. One person leaves early without saying goodbye. Another spends most of the time looking at a phone. The organizer feels confused. The plan seemed good. Yet something made part of the group uncomfortable. Creating comfortable private and social gatherings where everyone feels at ease requires more than good food and an interesting location.