OK, I am going to give two options for WonderMeal.....
1. Have Mrs. WM make plans with Mrs. T to hang out. Like she should imply but not directly say it is a girls thing. So then she will tell Mr. T to go make his own plans for that time. (Just make sure you aren't around when he is trying to figure out those plans.) The ladies' first stop should be breakfast at the hotel or somewhere nearby.....then you just happen to show up at the same place and join them.
2. Maybe this guy isn't so bad. Maybe he is just quiet when he is around people he doesn't know well or who are discussing things he isn't interested in or doesn't know much about. Maybe you should try to help him out by steering the conversation around to something he can get in to.