What is "tamborrada"

Tamborrada of Donostia (in Basque Donostiako Danborrada) is a celebratory drum festival held every year on January 20 in the city of San Sebastián, Spain. At midnight, in the Konstituzio Plaza in the "Alde Zaharra/Parte Vieja" (Old Town), the mayor raises the flag of San Sebastián. The festival lasts for 24 hours. Participants, dressed as cooks and soldiers, march in companies across the city. The celebration ends at midnight, when people congregate at the Konstituzio Plaza and the city flag is simultaneously lowered at various locations.