We had 14 (including 4 children) a couple years ago. We at together at:
'Ohana (twice), CRT, San Angel Inn, Mama Melrose, RFK @AK, Fulton's Crab House, Restaurant Marrakesh.
The only places we were split up werer RFK and Mama Melrose, but the tables were near each other (not close enough for conversation though).
The only one I would not do again was San Angel Inn. Too crowded for a big party. We were squished in a corner, and the server was having a hard time with a party that big (I know, I did my days of waitressing, it could have just been that server)