After the demo, without a machine doing it for you
Worth being plain about the follow-up, because demo invitations overpromise here constantly. There is no recording made on your behalf, no question feed, no poll and no scoring of who looked interested. What exists is your registrant list with statuses, a message you can broadcast to a chosen segment, and the links you supply yourself: the replay, the deck, the pricing page, the next session.
That is usually enough. Send one follow-up to the people who registered and a second to the ones marked as no-show, with your own replay link in the first and a short line in the second asking whether the next date suits them better. The list updates as replies come in, and the export gives you the same names in a file for whoever does the work afterwards.