We have used Gate 1 twice for escorted tours, both times they were limited to 40 people. At that point they were sold out.
Our ship obviously holds more then 40 passengers. I asked and was told that the tours were 40 at the most. Could anyone who has sailed on a Gate 1 River cruise tell me if you are touring ports with the same 40 or less passengers, or do the groups change every day, sort of first come, first serve. I know over the course of our escorted tours with Gate 1, we bonded with others on the tour, and would hope they are doing it the same way on their river cruises.