Nativity of Mary is celebrated on September 08, 2017. The Nativity of Mary, or Birth of the Virgin Mary refers to the birthday of the Blessed Virgin Mary. Tradition celebrates the event as a liturgical feast in the Roman Catholic calendar of saints and in most Anglican liturgical calendars on 8 September, nine months after the solemnity of her Immaculate Conception, celebrated on 8 December.
The Eastern Orthodox equivalent, the Nativity of the Theotokos pertains to the birth of the Virgin Mary in the Orthodox perspective. This feast, like that of the Assumption of Mary, originated in Jerusalem. It began in the fifth century as the feast of the Basilica Sanctae Mariae ubi nata est, now called the Basilica of Saint Anne. (With material from: Wikipedia)