September 13

In the Arabic Bayán the Báb called upon His followers to gather together once every nineteen days to show hospitality and fellowship. Bahá’u’lláh here [in the Kitab-i-Aqdas] confirms this and notes the unifying role of such occasions.

‘Abdu’l-Bahá and Shoghi Effendi after Him have gradually unfolded the institutional significance of this injunction. ‘Abdu’l-Bahá emphasized the importance of the spiritual and devotional character of these gatherings. Shoghi Effendi, besides further elaborating the devotional and social aspects of the Feast, has developed the administrative element of such gatherings and, in systematically instituting the Feast, has provided for a period of consultation on the affairs of the Bahá’í community, including the sharing of news and messages. 
- The Universal House of Justice  (The Notes section of the Kitab-i-Aqdas)