Brunch for 7 Girls in November?
Do you have a neighborhood preference?
I would try to reserve the private room downstairs at Blue Ribbon Bakery on Downing St in the west village. I've seen many bridal showers take that spot. I believe you need 6+ to get a reservation there.
I should also note that's incredibly cozy and would be great in November. You'll be downstairs not far from where they bake the bread for their restaurants in a huge brick oven.