I did ask about reserving a place, etc for a meet and greet cocktail hour or an area. Pretty much if they reserve it for you they charge you a fee and then a fee for bar service.
So I just told everyone where to meet (we chose the bar right off the meeting point area) and we just sort of "took" over that area. We handed out our coffee/drink mugs with out logo on it and everyone shared their room numbers with the people that they hadn't seen, etc. Then we all just ordered drinks from the bar and talked and hung out.
It worked but ours was really casual.
So basically I think if you are asking for a reserved area, they go the route of charging you per person for the bar service which I think was around $11-15 per person or something weird like that.
Depending on what time of year you get married I think there is usually a space that you can meet.
The main lobby (by the Rivieria section) has lots of places to go and sit, etc with the bar right there next too it. Depending on the time of the day/night it shouldn't be too busy.
Otherwise down in the Meeting Point area there is the outside bar & inside sports bar area. This is the area we picked since most people were staying by the beach section like us.
There is also a bar that is open (depending on the capacity of the resort) down by the beach, which you could use as an area as well if it were open.
The disco when it first opens (from being closed and the humid weather) smells pretty musty, some said like cat pee. However most nights we were there, our wedding guest group took the place over (we were there in May) and we sort of were the party each night. So that is a fun place to hang out as well that has a bar.
Good Luck on planning!