Cerdanyola del Vallès Main Festival Activity · Cerdanyola del Vallès, Vallès Occidental, Barcelona Image of Cerdanyola del Vallès, not of the place itself. Cerdanyola del Vallès celebrates two festas majors: the Roser de Maig, on the first weekend of May, and the patronal festival of Sant Martí, around 11 November, patron of the municipality, with a "correfoc" fire-run, castellers and sardanas. Photo: Ralf Roletschek (GFDL 1.2) What to see and do in Cerdanyola del Vallès