Ārāttu (pronounced[aːraːʈʈə]) is an annual ritual performed during Hindu temple festivals in Kerala, India, in which a priest bathe the idol of a deity by dipping it in a river or a temple tank. It is mainly carried out at the end of a temple festival. Ārāttu is celebrated twice annually—the spring festival (March - April) and the autumn festival (October - November). A festival normally lasts 10 days.[1]
A 1979 Malayalam film directed by I. V. Sasi was titled Aarattu, and a 2021 film directed by B. Unnikrishnan also use the same title, both the films are otherwise unrelated to the ritual.