Festivities of invierno de Sástago Activity · Sástago, Ribera Baja del Ebro, Zaragoza Image of Sástago, not of the place itself. Sástago celebrates the festival of San Antón from 16 to 18 January, with the monumental bonfire and the handing out of wine and roasted chorizo, as its winter festival; the main festival is in August, in honour of the Virgen de Montler and San Roque. Photo: Andrés Flajszer (CC BY-SA 3.0 es) What to see and do in Sástago