This particular feast is of a character suited only to initiates.
The above quote is Crowley's one and only comment on this verse. That's it folks. We're on our own on this one. So here's my personal take on it.
In a previous verse thread I mapped the Feasts onto the Tree of Life. This particular feast was attributed to Tiphareth. In my opinion this feast is a commemoration of an individuals K&C experience. The date on which the Word (Tahuti) is received and one becomes the Child of the prophet. As such there can be no set date for this most private of feasts.
Of course if you are a member of OTO this doesn't apply. And just like all the other "feasts" it's a good
excuse to eat, drink, and get high.