I was really beginning to think that trying to find out when the second formal night was had become an exercise in futility.
Finally, after speaking to no less than 4 people from reservations, shore excurions and customer service all of whom were delightful, I chanced upon an agent who actually looked it up! Thanks, Greg.
The nights are September 10 and September 14
September 10 does not pose a problem, but if you have booked a lengthy shore excursion in Cozumel and early seating, you may want to review it again. What still puzzles me is that we are in port until 7PM.
Oh, well. I will just have to forego the ruins and find something different that does not take a great amount of time in Cozumel. Any suggestions.