One of my least favorite things in the entire world is a panel prep call. I've probably been on at least two or three dozen by now and I've never ever felt like it was a good use of anyone's time. That is not to say that a panel shouldn't be organized beforehand--it absolutely should. In fact, most moderators don't take enough of a lead in quarterbacking a panel. That's why most of them suck. It's a free for all.