May/June - Senhor de Matosinhos

https://portugal.postsen.com/local/353527/Senhor-de-Matosinhos-starts-on-May-19-and-has-three-weeks-of-festivities.html

The Senhor de Matosinhos pilgrimage, which has been taking place for over 700 years, will begin on May 21 with a wide variety of concerts, exhibitions, competitions and parades .

The traditional decorative lighting on the main streets that host the City Festivities marks the beginning of one of the biggest pilgrimages in the country. Over the next three weeks, the center of Matosinhos will be transformed to receive the visit of around one million people.