Riḍván is a twelve-day festival in the Bahá’í Faith, commemorating Bahá’u’lláh’s declaration that he was a Manifestation of God. In the Bahá’í Calendar, it begins at sunset on the 13th of Jalál. In the Kitáb-i-Aqdas, Bahá’u’lláh ordains Ridván as one of two “Most Great Festivals”, along with the Declaration of the Báb. He then specified the first, ninth, and twelfth days to be holy days; these days mark the days of Bahá’u’lláh’s arrival, the arrival of his family and their departure from the Ridván garden, respectively.
The Festival of Ridván is observed according to the Bahá’í calendar, and begins on the thirty-second day of the Bahá’í year. The festival starts two hours before sunset on that day, which symbolizes the time that Bahá’u’lláh entered the garden.