Onam is the biggest festival of Kerala. But, there is a lot more to Onam than being just a festival. Onam reflects the faith of the people of Kerala; A belief in their legendary past, religion and power of worship. It shows the high spirit of the people who go out of the way to celebrate the festival in the prescribed manner and a grand fashion
Story goes that during the reign of mighty Asura (demon) king, Mahabali, Kerala witnessed its golden era. Every body in the state was happy and prosperous and king was highly regarded by his subjects. Apart from all his virtues, Mahabali had one shortcoming. He was egoistic. This weakness in Mahabali's character was utilized by Gods to bring an end to his reign as they felt challenged by Mahabali's growing popularity. However, for all the good deed done by Mahabali, God granted him a boon that he could annually visit his people with whom he was so attached. It is this visit of Mahabali that is celebrated as Onam every year. People make all efforts to celebrate the festival in a grand way and impress upon their dear King that they are happy and wish him well.
Onam Festival is celebrated in the beginning of the first month of Malayalam Calendar (Kolla Varsham) called Chingam. This month corresponds to August-September in Gregorian Calendar and Bhadrapada or Bhadon in Indian (Hindu) Calendar.