La Mercè is Barcelona's most significant festival, celebrated in honor of the Virgin of Mercy, the city's patron saint. Taking place from September 24 to 27, this event transforms Barcelona into a cultural hub filled with activities, concerts, fire shows, and parades featuring giants and big-headed figures. One of the festival's highlights is the "Correfoc," where groups of devils and fantastical creatures parade through the streets, igniting fireworks. The festival also features traditional Catalan "castells," or human towers, and family-friendly activities like workshops and dance performances. During four days, Barcelona will experience a musical explosion during La Mercè. Artists worldwide will perform across multiple stages, offering over 100 free concerts. Each year, around one million people enjoy a diverse program of leisure, culture, gastronomy, and community activities suitable for all audiences.