Romería de San Juan en Gaztelugatxe Activity · Bermeo, Gernika-Bermeo, Bizkaia Annual pilgrimage-festival held on June 24, the feast of San Juan, with a popular climb to the hermitage on the islet of Gaztelugatxe. 24 de junio (anual) Photo: Diego Delso (CC BY-SA 4.0) What to see and do in Bermeo