Additionally , Eastern Orthodox Christians commemorate her miracle at the Council of Chalcedon on July 11 .
The primary feast day of Saint Euphemia , celebrated by both Eastern and Western Christians is September 16 in commemoration of her martyrdom .
Eastern     commemorate Euphemia 's miracle at the Council of Chalcedon on July 11 .
The primary feast day of Saint Euphemia , celebrated by both Eastern and Western Christians is September 16 in commemoration of her martyrdom .