More than 1.8 million people participated in La Mercè 2015, the most important city festival in Barcelona. People took to the streets to enjoy the 500 activities scheduled between 18th and 24th September at various venues in the city. There have been seven days of celebration with a program aimed at a diverse and heterogeneous audience of all ages.
You can see the participation data for La Mercè 2015 in the attached document (in Catalan).