Onam is an ancient festival which still survives in modern times. Kerala's rice harvest festival and the Festival of Rain Flowers, which fall on the month of Chingam, celebrates the Asura King Mahabali's annual visit from Patala (the underworld).
The birthday of Sri Padmanabhan, the presiding Deity of Thiruvananthapuram, is on the Thiruvonam day in the month of Chingam. Thiruonam day is the most important day of Onam
Mahabali's rule is considered the golden era of Kerala. The following song is often sung over Onam:
Maveli nadu vaneedum kalam,
amodhathode vasikkum kalam
kallavum illa chathiyumilla