Waltz into winter this Saturday, courtesy of Cincinnati Opera's annual Opera Ball, "An Evening Under the Tsars," a Russian-themed gala inspired by Tchaikovsky's 'Eugene Onegin,' scheduled for July 2011. The annual fundraiser is always a lavish extravaganza and this year, the festivities move to the Netherland Plaza's iconic Hall of Mirrors, transformed into the royal cold-weather residence known as the Winter Palace.