Festivities of Sástago Activity · Sástago, Ribera Baja del Ebro, Zaragoza Main festivities of Sástago from 13 to 20 August, in honour of the Virgen de Montler and San Roque; on 25 April a pilgrimage is held to the hermitage of Montler. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Sástago