La Mercè is Barcelona’s biggest festival, celebrated to honour the city’s patron saint: concerts, traditions and family activities that you won’t want to miss. This year (2014) is celebrated between September 19th and 24th. More than 600 free activities all over the city.
WHEN?: September 19th to 24th (dates might vary slightly from one year to the next)
http://lameva.barcelona.cat/merce/ca/ -official program, only available a few weeks in advance
Video: © Barcelona Cultura