I think Diversions is unlikely to be the most suitable place for this game since it is really not suitable for children. I hate to sound like a prude (and I'm really not because I do think it's a great game and a lot of fun) but, since Diversions is a family lounge, I wouldn't like to think that families or children would be upset by anything they might overhear. Erin is right, though, we had already discussed in the FB group getting together to play this game but I do think it ought to be in one of the adult-only areas so as not to risk upsetting any other passengers.
ETA: Just realised that Diversions is adult only after 9pm. In which case, Diversions would be the ideal place after 9. Probably doesn't matter what night. I would actually suggest, since there were a few people that wanted to play board and card games, that we set a time each night and people can turn up if they fancy playing something.