There are no group meetings arranged here, its a small island and a lot of people get into their own clicks or groups or assimilate, hence why there is very little traffic on this website after people arrive.
It honestly depends on what industry you are in which will depend on how you get word out to expats as there arent expat groups specifically.
To put it plainly, when people arrive and settle its a melting pot on island and a lot of people dont consider themselves expats anymore as they assimilate into the Caribbean way of life, is there anything you are missing that requires an expat meet up as opposed to just a way of meeting new people on island irrespective of whether they are local or expat?