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Baha'i
Baha'is are observing the Ridvan season and there are twelve days of Ridvan which commemorate the proclamation of Baha'u'llah in 1863 that He fulfilled the promise of the Bab that He was "Him Whom God would make manifest". There are three Holy Days of Ridvan in which work is abstained from... the First, Ninth and Twelfth Days of Ridvan.