“La Patum” is a traditional festival celebrated in Berga (Catalonia) declared by UNESCO as a Masterpiece of the Oral and Intangible Heritage of Humanity in 2005. You can find more information in the Wikipedia: Patum of Berga.
The most solemn moment is probably “El ball de l’Àliga” (The Dance of the Eagle). I’ve drawn his protagonist 🙂

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The impressive dance (starts at 3:45″):