Pilgrimage of San Sebastián do Arrabal Activity · Oia, Baixo Miño, Pontevedra Image of Oia, not of the place itself. A pilgrimage festival held every 20 January at the hermitage of San Sebastián, in the place of O Arrabal; it opens the festive calendar of Oia in the depths of winter, when the sea beats against the Cistercian monastery. Photo: Contando Estrelas from Vigo, España / Spain (CC BY-SA 2.0) What to see and do in Oia