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,
manusharellarum onnupole
amodhathode vasikkum kalam
apathangarkkumottillathanum
kallavum illa chathiyumilla
ellolamilla polivachanam
kallapparayum cherunazhiyum
kallatharangal mattonnumilla
adhikal vyadhikalonnumilla
balamaranangal kelppanilla

”