August 8

There is no prescribed way for the recital of the many other Bahá’í prayers, and all are free to use such non-obligatory prayers in gatherings or individually as they please. In this regard, Shoghi Effendi states that:

...although the friends are thus left to follow their own inclination,... they should take the utmost care that any manner they practise should not acquire too rigid a character, and thus develop into an institution. This is a point which the friends should always bear in mind, lest they deviate from the clear path indicated in the in the Teachings. 
- The Universal House of Justice  (The ‘Notes’ section of ‘The Kitab-i-Aqdas’)