I'll support what Ms. McPherson said. My experience too is that, especially with only one meeting time that you can accommodate, it may be hard to get witnesses to fit in within specific times, so it's better that we at least get that ball rolling. There are probably some higher-level witnesses to get the ball rolling, and then we can move from there.
Maybe there could be two lists, with two dates, but it would be something for us to at least get started.