Generally the host hotel is a hotel where Olivia negotiates a discount for folks flying into a departure city (for a cruise) and in earlier days they used to host a pre-cruise party. Since the charters are going out of two different cities and since there are limited seats I don't know if Olivia will have a "host hotel" in Ft. Lauderdale or Miami. I can't remember what they did last year but I am sure someone at Olivia can answer that.
On this particular trip last year, many ladies booked their own flights to Columbus Isle and got in a day or two early or left a day or two late. Some connected in Nassau and decided to stay overnight and meet up there on their own. Others went on and stayed at Columbus Isle. As I recall, Olivia worked with Club Med to get a special rate for those folks. That's why I mentioned it as a host hotel.
Hope that clears up any confusion.