Argh... okay so I have found the most perfect place. The issue is, the place is a historical site (think museum, it's not a museum though but a mansion) and it has many rooms/areas. We have at least 150 people, if we did it here we could have our 200 even...but the problem is the guest would dine in 2 separate rooms.
I kinda like the idea, I think we can work it and it'll be different. Dancing will be in a common room, and the dinning areas would still be accessible. In the dancing area we could still have smaller tables and chairs for people to rest if they'd like to do so there. The two dining room areas could be "linked" via a carpet or pathway to not make it seem like they are being segregated maybe. The rooms are connected via a lovely stone-floored courtyard so it would be easy to do. The doors to these rooms would not be closed of course.
My mom and HF are unsure. They think people might feel segregated or must just dislike the idea in general. What do you ladies think?