Festivities of invierno de Cinco Olivas Activity · Cinco Olivas, Ribera Baja del Ebro, Zaragoza Image of Cinco Olivas, not of the place itself. Winter festivals of Cinco Olivas, a town in the comarca of Ribera Baja del Ebro, in Zaragoza. These are the municipality's main festivals and are held in February, in honour of San Blas. The village also keeps smaller, summer-season festivals in August. Photo: Juan Emilio Prades Bel (CC BY 4.0) What to see and do in Cinco Olivas