The list is the whole follow-up
Everything after a session runs off the attendee list. It holds each person with a status — registered, attended, waitlisted, cancelled, no-show — and it exports as CSV or PDF. Page views and the sign-up rate are counted too, which tells you whether the page worked, but the names and their statuses are what you actually write to.
One honest caveat shapes the whole thing: attendance is recorded by the host. Nobody verifies who was in the room beyond what you mark. That is not a weakness, provided you are the one being honest about it — and it is precisely why the statuses matter, since they are the difference between one generic message and three that people answer.