Repressed memories and grand opera are dance partners in 'Seven Veils' / The new opera telling the Iron Lady's story / In a new opera, a life in music and a struggle with memory loss intertwine / Miss Manners: How do we dress for the opera? / American opera needs 'The Comet / Poppea.' Yuval Sharon's experimental dialogue with history is exceptional in every way / Opera, glass blowing, poncho weaving and more: UNESCO celebrates world's cultural heritage