Three emails, sent at the right moment, do more than a ten-email drip. Here is the exact sequence.
Sent right after registration. One sentence on the problem, the date in the visitor's time zone, a calendar button.
Sent the day before. What attendees get live that the replay will not give them: the Q&A, the templates, the chance to ask about their own funnel.
Sent one hour after the live, to attendees and no-shows alike. No-shows who watch the replay are the best candidates for the next session.