Onam is an annual festival celebrated in southern Indian state of Kerala. It is a harvest festival celebrated by Malayalis particularly Malayali Hindus whose date is based on the Panchangam and falls on the 22nd nakshatra Thiruvonam in the month Chingam of Malayalam calendar, which in Gregorian calendar overlaps with August–September. According to legends, the festival is celebrated to commemorate King Mahabali, whose spirit is said to visit Kerala at the time of Onam.