I was thinking about the weekly JMP Getting Started webinar (e.g. Getting Started With JMP | JMP), and how it might be more visible. I think it would be nice for users to get a toast-style message in JMP (or something similar) that says something like "Starting in 3 hours 28 minutes: Getting Started with JMP, a live weekly webinar from JMP". You could, of course, do similar for other webinars, etc, if something like this was implemented.
Of course, there should definitely be a way to opt out of receiving any further notifications, but I would bet that a lot of new users never really learn about this webinar!