Seixalíada is undoubtedly one of the highlights of the Seixal municipality's sporting and social calendar, and is the great festival of popular sport. This initiative is the most emblematic event of sport for all in the country and an example of the joint work between the Associative Movement and the Local Authorities in the area of sport.

Launched in 1982, the Seixalíada has become a powerful factor in integrated sports development in the Seixal municipality. Over the course of its 39 editions, it has grown, enriching itself with new disciplines and boosting the profitability of new sports venues, testing calendars and costumes, making a decisive contribution to mobilising and motivating residents to take part in sport.

In this way, Seixalíada is seen as the major driving force behind the municipality's sporting development.