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The primary event of the social year is the annual festival of Portuguese Communist Party, that attracts hundreds of thousands of visitors. The event consists of a three-day music festival with hundreds of Portuguese and international bands and artists on five different stages, in addition to ethnographic demonstrations, gastronomy, social debates, books and music fair, the Avanteatro (theatre) and sporting events. Several foreign communist parties also participate. The events preparation begins following the conclusion of the annual festivities, through the initiative of party members and youth volunteers.
Vasco da Gama, the sailor who discovered the way to India by sea, lived in Seixal with his brother Paulo, on "Quinta da Fidalga". Its foundation dates back to the 15th century. It is one of the oldest and best preserved examples of farm and recreation farms in the region. Still in the 18th century, it stood out for its excellent orchards of citrus, streets covered with wild trees and vineyards in trellises. Two wells equipped with daisies provided water for irrigation. It is also distinguished by the tidal lake, which constitutes a rare or almost unique monument in Portuguese hydraulic architecture. It has a chapel that was integrated in the palace in the middle of the 20th century in place of an older one. The interior walls are lined with 18th century tiles and reproductions also from this period.