He was admired and loved by the masses and enjoyed a prosperous reign. According to mythology, king Mahabali - an asura - ruled over Kerala. Onam commemorates Mahabali and Vamana mythologies in Hinduism. It is considered more of a cultural festival which is all-inclusive than a religious one. Onam is celebrated in the Malayalam month of Chingam, which occurs during August–September in the Gregorian calendar and culminates with Thiruvonam.Įven though Onam is primarily a Hindu festival, non-Hindu communities in Kerala also celebrate Onam. Onam is an annual festival celebrated by the Keralites across the world.