Onam is the harvest festival of Kerala. Onam has two specific significances. First it is the communal memory and celebration of past history as enunciated in the Mahabali legend – a story of how paradise was lost. Second it is the celebration of the harvest, tied with the memory of the golden age of prosperity... The festival is the harbinger of spring — signalling the start of the harvest season. Onam epitomises the newfound vigour and enthusiasm of the season, and is celebrated with traditional fervour with visits to temples, family get-togethers, gifting of clothes called Onakkodi and lots of merrymaking. The Keralites perform the Mohiniattam Dance, dedicated to the female form of Vishnu Mohini. There is also the Krishnanaattam dance. Many Keralites also worship Narayani. http://en.wikipedia.org/wiki/Onam