Festivities of invierno de Gelsa Activity · Gelsa, Ribera Baja del Ebro, Zaragoza Image of Gelsa, not of the place itself. Gelsa celebrates San Antón on 17 January (bonfire in the Plaza Mayor on the night of the 16th), organised by the Cofradía de San Antón, patron saint of animals; its main festival is in September, in honour of the Virgen del Buen Suceso. Photo: Ecelan (CC BY-SA 4.0) What to see and do in Gelsa