The part people forget: the site keeps the books
What a page like this is really for is the second half of the phrase: registrations. The list is part of the site rather than a separate export, and it keeps a status per person โ registered, attended, waitlisted, cancelled, no-show โ which is the difference between a headcount and a plan. Take it out as CSV or PDF whenever someone asks. Page views and the sign-up rate are counted too, so a date that drew traffic but no names is visible as that instead of being a matter of impression.
None of it is a screen of live charts. The list updates as replies come in, and you read it when you go to it. A webinar is a short project; the record only has to answer three questions well enough to plan around them: who is coming, who has not, and what you send them afterwards.