THIRUVANANTHAPURAM, Sept. 3: A retrospective of films directed by Adoor Gopalakrishnan is being held at the 10-day Figuera da Foz International Film Festival at Portugal. Eight Malayalam films made by the reputed director will be screened during the festival. The showing has been organised to coincide with the 500th anniversary of the landing of Vasco da Gama on the Kerala coast.