San Fermin festival holds an "international fireworks" competition each year during the 9 day fiesta. The fireworks start each night at 23:00 for the entire duration of the festival and usually last for 40 minutes. Head to the Pamplona Bus Station or if you know the city then head for the Ciudella Park. Tip: arrive 1 hour earlier to get a prime locaction & sit on the grass to enjoy a wonderful spectacle each night!