 Yet the main highlight may be the rowing boat competition, where teams from different towns of the Bay of Biscay contend for the Flag of La Concha.Thousands of supporters coming from these coastal locations pour into the city's streets and promenades overlooking the bay to follow the event, especially on the Sunday of the final race.All day long the streets of the Old Part play host to droves of youths clad in their team colours who party there in a cheerful atmosphere.