Festivities of invierno de Yebra de Basa (San Antón) Activity · Yebra de Basa, Alto Gállego, Huesca Image of Yebra de Basa, not of the place itself. Yebra de Basa lights the bonfire of San Antón on 17 January; its main festival, however, is the Santa Orosia pilgrimage on 25 June, which it shares with Jaca ever since tradition placed the saint's head in the village and the rest of her body in the city. Photo: DonCamillo (CC BY-SA 4.0) What to see and do in Yebra de Basa