Festivities of invierno de Peralta de Calasanz Activity · Peralta de Calasanz, La Litera, Huesca Image of Peralta de Calasanz, not of the place itself. Peralta de Calasanz's winter festival is held in the municipality that in 1970 united the four depopulated villages of Peralta de la Sal, Calasanz, Gabasa and Cuatrocorz, taking the name of José de Calasanz, born in 1557 and founder of the Escuelas Pías, Europe's first network of free schooling for poor children. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Peralta de Calasanz