Festivities of Costur Activity · Costur, L'Alcalatén, Castellón Image of Costur, not of the place itself. Costur celebrates San Antonio Abad on the weekend nearest 17 January, with a bonfire, blessing of animals and the handing out of the rollo de San Antonio; its August patronal festival is dedicated to the Assumption of the Virgin and the Santísimo Cristo del Calvario. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Costur