To celebrate George Balanchine’s 100th birthday, New York City Ballet is planning a season-long retrospective of his work, presenting 81 of his ballets. “Among those who will participate are Valery Gergiev, the conductor and director of the Kirov Theater in St. Petersburg, Balanchine’s birthplace in Russia, and the Georgian State Dance company, the professional folk dance company from Tbilisi. Balanchine, who died in 1983, was of Georgian descent.”