We were part a group on an Alaska cruise with Royal Caribbean, although we didn't know anyone in the group. Our agent put us in it so we could get the group amenities.
Anyway, as Bill said, our tables were adjacent to one another and people changed tables every night to get to dine with their other friends and family. The staff rolled right along with no problems. And we got to meet pretty much all of them when the 7 days were over.