Ridván begins (Bahai)
Ridván (Arabic: ﺭﺿﻭﺍﻥ translit: Ridwán; Persian transliteration: Ridván) is a twelve day festival in the Bahá'í Faith, commemorating the commencement of Bahá'u'lláh´s prophethood. It begins at sunset on April 20th and continues until sunset, May 2nd. On the first (April 21st), ninth (April 29th) and twelfth days of Ridván (May 2nd), work and schooling is suspended.
"Ridván" means paradise, and is named for the Garden of Ridván, outside Baghdad where Bahá'u'lláh stayed for twelve days after the Ottoman Empire exiled him from Baghdad and before commencing His journey to Constantinople.
It is the most holy Bahá'í festival, and is also referred to as the "Most Great Festival" and the "King of Festivals".