On our webinar programs we schedule a reminder for 1 or 2 hours before the webinar; it's done as a "batch-run-later" campaign.
However, this particular campaign was not set on a recent webinar and we lost c. 60% of our usual attendance due to this. So the first thing is to say that, anecdotally at least, webinar reminders close to the event DO work.
However, I am now thinking about how to further automate this e.g. can I trigger from a token? We use a program token for start time anyway, I know the trigger would still have to be activated though.
Any ideas would be most welcome.