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Photo: larry&flo, CC BY-SA 2.0 via Wikimedia Commons
Barcelona's main annual festival around 24 September, encompassing many events such as human towers (castellers), free live music events on the streets, firework displays, and processions of wooden giants. It is a holiday and the city offers a lot of activities to have fun. Enjoy a fountains and fireworks show at the base of the Montjuïc hill.
La Mercè is the annual festival of the city of Barcelona in Catalonia, Spain. It has been an official city holiday since 1871, when the local government first organized a program of special activities to observe the Roman Catholic feast day of Our Lady of Mercy. Although the actual feast day is September 24, the festivities begin a few days beforehand.