Since the whole event takes place on, and in, the lake, could the 24 and 12 be a day and night, or a night and a day.Does this relate to an event time period of say when Mars appears to vanish from the sky ?
The 20 oars, 20 maidens, 20 pendants make up an hour within the lake time..One pendant drops off, presumably that is the event. I don't know. You are more clever than me.I could hazard a guess that the 20, 20, 20 are meteor shower within the sky 24,12..but the numbers are a bit precise.
Could the 20 oars be 20 somethings of the Argo Navis constellation, the Boat of Osiris.
Did they use a straight 28 day lunar cycle or the 29.1/2 .
Best wishes with your hard work