Bermeo and Mundaka commemorate and perform the quarrel between both towns to obtain the custody of the Isle of Izaro. On July 22nd the Bermeo's Council gets together to attend the High Mass in Santa Eufemia church.

Soon after, the bands liven up the streets with their music and the representatives of the local authorities leave the town by boat towards Elantxobe, stopping at the rear of the island to throw a tile as a symbol of Bermeo's property of the island. In the evening, the boat continues from Elantxobe towards Mundaka and arrives finally in Bermeo, after one hour and thirty minutes.