Matinée Summer Festival
L'illa Fantasia Finca Mas Brassó S/N, 08339 Vilassar de Mar

Dozens of music festivals are held in Barcelona throughout the summer, but only one stands out for its wet and wild venue. Illa Fantasia is the largest waterpark in the province of Barcelona, with more than 22 slides, three big pools and a picnic area, and it’ll host the ninth annual edition of Matinée Summer Festival. Although located outside of the city, in Vilassar de Dalt, you can drive or take the C-3/4 bus from Ronda de la Universitat. This year, DJs Flavio Zarza, Lydia Sanz, Taito Tikaro, Dario Nuñez and Andre Vicenzzo will be joined by a performance from Barcelona-based vocalist and musical producer Estela Martin for 12 hours of nonstop music. If you fancy a siesta between sets, the waterpark is also equipped with rest zones, as well as miniature golf, bars and restaurants to take a break from the bumping bass. The festival begins at 10am. Tickets, which include two drinks, cost €43.40 at the door.
More information here.