D.H.
A. ~
You can also try the community centers. I know that Woodhaven, Brownstown, Lincoln Park and Flat Rock rent theirs out. Although Flat Rock (which is gorgeous!) you have to use their caterer. The rooms run around $100 - $200 (I think), but it also depends on the day or may be cheaper during the day compared to at night, and some have some smaller rooms.
I wonder if you could do something at a hotel, maybe. Rent a couple of rooms then you have the pool for the kids to play in....
good luck!
D.