Ann Ziff was going to forgo her annual holiday party this year, but when she heard about photographer friend Ahmet Ertug's new book "Palaces of Music: Opera Houses of Europe," she decided it was reason enough to celebrate. "I thought I would combine the two," Ms. Ziff said Tuesday at her Tamsen Z jewelry boutique on the Upper East Side. "It's a chance to see such good people." Friends attending the event included Renée Fleming and Martha Stewart.
