La Mercè (Festes de La Mercè) (Around 24 September annually (feast day of Mare de Déu de la Mercè); 2026 edition: 23–27 September). Barcelona's largest annual civic festival, honouring one of the city's two patron saints. Free outdoor concerts, human towers (castellers), fire runs (correfocs), and hundreds of cultural activities city-wide.
Sant Jordi (Day of Books and Roses) (23 April annually). Catalonia's Day of Saint George, patron saint of Catalonia. Tradition of exchanging roses and books; streets fill with flower and book stalls along Las Ramblas and Passeig de Gràcia. Coincides with UNESCO World Book…
Primavera Sound (Late May to early June annually (2026 edition: 4–6 June)). Annual international music festival held at Parc del Fòrum since 2005. Founded 2001. One of Europe's most influential indie and alternative music festivals.