Nevada Opera opens its 2004-2005 season with Turandot. In Puccini’s final opera, Princess Turandot devises three riddles to test her suitors. Those who fail are put to death. One day a stranger arrives and answers her questions. He offers to relinquish his claim of marriage and face death unless she can discover his identity before sunrise. Will the impervious Turandot accept his challenge? Find out this weekend with performances at 8 p.m. Nov. 5 and 2 p.m. Nov. 7 at the Pioneer Center, 100 S. Virginia St. Tickets are $24-$74. Call 686-6600.