There are a couple of articles about this; the concert is actually sponsored by Celebrity Cruises, and according to one article, is available only to Celebrity guests. Apparently there were four Celebrity ships in SXM on December 28, and that's when the concert was actually held. I didn't see anything about another performance on NYE although I do see where she'll be featured on the TV show. I wonder if those segments are recorded, or if there will actually be another concert.