No art fair is just about the action under its roof. Relationships are really forged outside its doors. During Zona Maco, Apr. 6-10, 2011, social networking opportunities abounded at gallery openings, collector dinners, cocktail parties and lunches at places like Contramar, a seafood house in the Roma district popular with the art crowd. On any given day of the Mexico City fair, its tables were filled with so many dealers, collectors and artists, it was hard to imagine anyone was left at the convention center.