La Mercè is Barcelona’s biggest festival, held every September in honor of the city’s patron saint, the Virgin of La Mercè. During this celebration, Barcelona’s streets come alive with traditional events like castellers (human towers), correfocs (fire parades), and music and dance performances. Parades with giants and big-headed figures also take place, filling the city with color and tradition. It is one of the most beloved festivals, blending popular culture with modern events, bringing thousands together in a uniquely festive atmosphere.