These kinds of reminders are so easy to send out anymore with most people having text or email access. I use a similar system with my students: an app where I can send them reminders about homework, tests, due dates, etc. Just takes one click, and I can notify 90 students all at once. Love it. My chorus uses the same system to send out reminders, seating charts, rehearsal notes, etc. My pharmacy sends a phone call when prescriptions are ready. It's just the way of technology now.

My T is still old school in their system and they personally make those calls, but I would guess they'll eventually catch up to technology and go automated.