- April
1853: Baha’u’llah arrives in Baghdad
- April
1948: First Annual Convention of the Baha'is of Canada
- April
1848: On the orders of the Persian Grand Vizir the Báb is transferred from
the fortress of Mah-Ku to the fortress of Chihriq
- March-April
1847: Muhammad Shah sent a letter to the Báb and in courteous terms
instructed Him to go to the fortress of Mah-ku
- March-April
1916: The first eight Tablets of the Divine Plan were revealed by ‘Abdu’l-Baha
- April
1911: Louis Gregory makes a six-day pilgrimage to visit ‘Abdu’l-Baha in
Ramleh, Egypt
- First
Day of Ridvan (April 21, 1863): Baha’u’llah reveals the Surih-i-Sabr