The reminder pattern that shrinks the column
Three emails go out on their own to everyone registered: 24 hours before the start, one hour before, and 15 minutes before. The sending is automatic; the switch is yours, and the first thing to check after a poorly attended session is whether you had switched them off.
The 24-hour email does most of the work, because it is the one that turns an intention into an appointment โ it arrives at dinner, when people can actually put the hour into a diary. The 15-minute email is the one that rescues the person who meant to join and got distracted at seven. Both reach the registrant list; nobody gets a WhatsApp reminder from us, and WhatsApp is used to tell you, the host, that someone registered.
There is also a quieter lever: the confirmation email itself, which carries a calendar file and a Google Calendar link. Nothing forces anyone to use either, so a reminder line that says "the calendar file is in the confirmation email if you want to drop this into your diary" costs one sentence and converts intention into an appointment.