found
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Official website of Department of Tourism, Government of Kerala, viewed on November 29, 2017:
events page (Onam, a celebration of equality, justice, and prosperity, is the State festival which unites all Keralites irrespective of caste, colour, or creed, and is celebrated in Kerala with pomp and grandeur. The whole state joins in the fervour to celebrate the return of the King Mahabali to meet his "prajas" (subjects). Legend has it that every year, King Mahabali, the righteous king visits the land from the nether world and Keralites unite in festivities to welcome the return of the mythical King Mahabali)