Covenant Day is a celebration of unity and continuity in the Bahá'í Faith. According to this religion, from time to time God reveals His will and Providence through another of His Manifestations. Thus, God instructs people and gives them the laws and rules necessary at this stage of human development. This is the principle of progressive revelation.
This day is associated with 'Abdu'l-Bahá, the son of the founder of the Bahá'í Faith, whom Bahá'u'lláh appointed as the Center of His Covenant. In other words, a successor to His Cause and an authorized interpreter of the Teaching.
'Abdu'l-Bahá decreed that his birthday should not be celebrated, as it fell on the Day of the Báb's Call (May 23), which should be devoted entirely to this event.
However, at the request of the believers, 'Abdu'l-Bahá instituted the feast of the Day of the Covenant, which is dedicated to this remarkable personality.
Unlike other Baha'i holidays and holy days, this day is not a holiday.