Onam festival marks the homecoming of mythical king Mahabali, who emerges from the netherworld to visit his people in Kerala. According to Onam's popular myth, Lord Vishnu, who took the avatar of Vamana, sent Mahabali to Paathalam (an imaginary place below the earth) as many were jealous of his popularity. However, he was granted the boon to visit his subjects once a year. Onam is celebrated in the Malayalam month of Chingam. The 10-day-long harvest festival is celebrated from Atham to Thiruvonam.
All the B-town celebs are excited and have shown their love and respect for the festival by posting their wishes on Twitter, here take a look