Bluffer's would be an interesting venue for a group dinner for sure.
If you're thinking of heading out in that directon, Vincent's Spot on Kingston near Midland is a nice family-operated old-school Italian restaurant with good food. It's pretty small so you'd have to book ahead. Well, with a group that size you'd have to make reservations anywhere. Click on the place link to find threads/comments on Vincent's.
7 Brimley Rd, Toronto, ON M1M, CA
2496 Kingston Rd, Toronto, ON M1N1V3, CA