The event, organized via social media, attracted approximately 3,000 people. The 'therian' subculture involves individuals who identify as non-human animals, often wearing masks and mimicking animal behaviors.

While the afternoon started peacefully, the situation deteriorated into vandalism and damage to public property. Guàrdia Urbana and Mossos d'Esquadra had to intervene to clear the area and restore order.

Police sources confirmed that four arrests were made by the Mossos d'Esquadra, while the Barcelona local police carried out the fifth arrest during the late-night disturbances.