The room in which the Báb declared His mission to Mulla Husayn - Shiraz, Iran The Declaration of the Báb later this month is a Baháʼí Holy Day and one of the two 'Most Great Festivals' in the Baháʼí calendar. For Baháʼís around the world, the Declaration of the Báb is a joyous celebration of the announcement in May 1844 by a young merchant, in an upstairs room of a house on Shiraz, Iran, that he He was the bearer of a message destined to transform the life of humanity. At a t