Coso Blanco 2019 - Castro-Urdiales - Thursday, July 4 Thursday, July 4↕ Friday, July 5 20:00 Creative contests and Announcement and beginning of festivities. Fri., Jul. 5> You can find out more on Fiestas.Net You might be also interested in: Fiesta of Sanfuentes 2019 - Sanfuentes (Biscay) - 20 Kms. Saint Peter 2019 - Munguia (Biscay) - 45 Kms. Fiesta of Abusu 2019 - Abusu (Biscay) - 40 Kms. Fiesta of Adurza 2019 - Adurza (Alava) - 93 Kms.