The Morcillona of 8 December Activity · San Cebrián de Castro, Tierra del Pan, Zamora Image of San Cebrián de Castro, not of the place itself. Fontanillas de Castro celebrates the Inmaculada Concepción on 8 December in a festivity that the residents know as La Morcillona, the winter event of a hamlet of around eighty inhabitants. Photo: El alistano (CC BY-SA 4.0) What to see and do in San Cebrián de Castro