A monthly dinner group? That sounds like it would actually work. Just put an ad in the weekly or on meet-up and say you are looking for other paleo/primal eaters to form a monthly dinner group. Since paleo/primal would be the main thing in common among all you otherwise strangers, it would be the one thing you'd all discuss and I'm sure it would end up being a wonderful experience. Kind of like how I do the Sierra Club hikes. They are open to the public. Hiking is what we have in common so all these strangers get together and hike and have fun.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting bench press: 30lbs. Current bench press: 75lbs.