Hmmm...I was going to suggest Blowfish (in SF
also, but there are usually a lot of people
there.  Another good sushi place is Yoshi's in
Jack London Sq. (right across the Bay Bridge from
SF).  I think they have rooms which are separated from the main room to accommodate large groups.
But I'm open to anything.  Maybe lunch would be
better because places are less crowded.  I'm
flexible though.

Graham