New exhibitors are making their marks in the venerable line-ups of major shows this weekend. At the 56th annual Winter Antiques Show, six new exhibitors have joined the ranks, including 20th century decorative arts specialists Liz O'Brien and Lost City Arts. The American Folk Art Museum's The American Antiques Show, with its all-American offerings, mostly in the folk art and American furniture categories, are now punctuated with Tiffany lamps, a specialty of new exhibitor Lillian Nassau, LLC...