The list is the whole tool
Attendance work happens on one surface: the registrant list on your dashboard, which fills name by name as people answer on the page. Each row carries a status, and each status is a small instruction about what to do with that person before, during or after the session.
It is worth being precise about what the list does and does not know. It knows who registered, because registration is what built it. It knows who was invited, who was waitlisted and who cancelled. It does not know who sat down in front of the meeting, because nothing reports attendance back to us from your platform. You mark that, and the marking is honest precisely because it is yours.