Vadakkupurathu Pattu is a 12-day Kalamezhuthu Pattu (ritualistic art and song) performed once every 12 years to appease Goddess Bhadrakali. This sacred event, conducted on the Karthika day of the Malayalam month of Meenam, takes place in the northern courtyard of the Vaikom Mahadeva Temple, accompanied by special rituals and Guruthi offerings.