Patron Saint Festivities of Costur Activity · Costur, L'Alcalatén, Castellón Image of Costur, not of the place itself. Patronal festivities of Costur in honor of the Assumption of the Virgin and the Santísimo Cristo del Calvario, celebrated in August and considered the most important festivities in the town. They include an evening procession that brings together all the residents, as well as bull runs, dances, and communal meals. agosto Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Costur