La MercĆØ Festival
La MercĆØ is Barcelonaās largest annual festival, celebrated around September 24th in honor of the cityās patron saint, Our Lady of Mercy (La Mare de DĆ©u de la MercĆØ). First officially recognized in 1871, this week-long celebration transforms the city into a grand stage for Catalan culture, with street parades, concerts, traditional dances, castellers, and fireworks.