The Festival de la Canción de Viña del Mar is held in the Quinta Vergara amphitheatre each February and is the largest popular music festival in Latin America by television audience. It runs over several evenings, mixing international pop and rock headliners with a competition for new Latin American artists, and the whole event is broadcast live across the continent. Tickets for the main shows are expensive and sell quickly; the festival generates a city-wide party atmosphere regardless of whether you have seats.
If you are planning a visit during February, check the festival dates before you book — the city fills completely, accommodation prices double or triple, and the atmosphere either excites or frustrates depending on your temperament. For music fans it is a genuine occasion; for everyone else, it is a very good reason to come a week earlier or later.