POCATELLO — Those who can’t wait until next summer to feast on authentic Greek gyros and pastries will have the opportunity this fall. The Blessed Virgin Mary Greek Orthodox Church in Pocatello is preparing to hold its Greek Gyro and Pastry Fall Fest on November 9. “Come on down, support a great cause and enjoy the best gyros in town. Opa!” said Father Constantine Zozos. Opa is an expression shouted at Greek festivals that expresses joy. While the festival is still over two weeks away, some of the members of the Philoptochos Ministry, the parish’s women’s organization, are already hard at work…