The Supreme and Holy King of U.S. Grand Lodge of O.T.O. issued these greetings regarding the First Night of the Prophet And His Bride:
“Today (this evening) is an official feast day in Thelema–an anniversary celebration of the date that Aleister Crowley and Rose Edith Kelly (Soror Ouarda), were married 117 years ago. Kelly later played a critical role in the Cairo Working, which led to the reception of The Book of the Law.
‘A feast for the first night of the Prophet and his Bride!”
Liber AL II:37
‘There should be a special feast on the 12th day of August in every year, since it was the marriage of The Beast which made possible the revelation of the New Law. (This is not an Apology for Marriage. Hard Cases make Bad Law).'”
https://sabazius.oto-usa.org/feast-for-the-first-night-of-the-prophet-and-his-bride-2/First.