While the Dallas Art Fair has opened the door to a growing number of collectors, the city's stalwarts continue to play an active role. In addition to being among the first to walk through each April installment during the Patron Preview, many of them generously open their homes and collections during that weekend. This year, prior to the public opening, one of its sponsors, Marguerite Hoffman, will welcome exhibitors to her Bill Booziotis-designed guesthouse and exhibition space known as B2...