Fiestas de Otxomaio en Orduña Activity · Urduña/Orduña, Arratia-Nerbioi, Bizkaia Festivities of Orduña with bullfights considered the oldest in Bizkaia, as well as displays of traditional Basque rural sports. finales de abril / principios de mayo Photo: aiaraldea.com (CC BY-SA 2.0) What to see and do in Urduña/Orduña