"The 2-Hour Cocktail Party" is a social guide by Nick Gray that focuses on hosting efficient and enjoyable gatherings. The book emphasizes the importance of keeping parties short, specifically to two hours, to maintain energy and engagement among guests. Gray provides practical tips on planning, inviting, and executing a successful cocktail party. He encourages hosts to create a relaxed atmosphere, serve simple drinks and snacks, and facilitate conversations to help guests connect with one another. The approach aims to make socializing more accessible and less stressful for everyone involved.