Vishnu is believed to have appeared to the sage Medhavi and married his daughter at this temple, witnessed by Brahma and other gods. Six daily rituals and four yearly festivals are held at the temple, of which the Brahmotsavam, celebrated during the Tamil month of Margazhi (December-January), is the most prominent. The Kal Garuda image in the temple used during the festive occasions is believed to increase in weight seeking 4, 8, 16, 32, 64 and 128 people in succession when the procession comes out of various gates from the sanctum to the main entrance of the temple. Nachiyarkovil is famous for Nachiarkoil lamp brass lamp. The lamps are made by resident artisans called Pathers (Kammalar) who are living in large numbers at Kammalar street, Natchiyarkovil.