Baha'i Holy Days:

- First day of Ridvan (Declaration of Baha'u'llah), April 21, 1863
- Ninth day of Ridvan, April 29
- Twelfth day of Ridvan, May 2
- Declaration of the Bab, May 23, 1844
- Ascension of Baha'u'llah, May 29, 1892
- Martyrdom of the Bab, July 9, 1850
- Birth of the Bab, October 20, 1819 
- Birth of Baha'u'llah, November 12, 1817
- Feast of Naw-Ruz (Baha'i New Year), March 21

On May 23, Baha'is all over the world will celebrate one of the nine holy days in the Baha'i calendar -- The Declaration Of The Báb.
The holiday commemorates one of the most important events in Baha'i history, when the Báb announced in 1844 that he was "the bearer of a Divine Revelation which would prepare humanity for the advent of the Promised One of all religions". In 1863, following years of persecution for the Báb and his followers, Bahá’u'lláh declared that he was the Promised One that the Báb had announced.