The compounding that actually happens
Growth in this shape is boring and reliable: one session, one page, one list, one honest invitation to the next date, one new page for that date with its own list. Since a webinar page holds a single session, the audience arrives in clean groups rather than in one undifferentiated pile, and each group can be addressed with a message that refers to something real.
Two small mechanics help along the way. A seat limit with places-left messaging and a waitlist mean a full page produces a segment of people who actively wanted in โ the friendliest names you will ever write to. And a page view count with a sign-up rate tells you whether the invitation was understood, which is more useful than vanity reach.