Would be nice to be able to write your own custom message to appointment notification(s) in calendar.

E.g.,
Notification 1 (90 before appointment) > Custom message = "Get ready".
Notification 2 (30 before appointment) > Custom message "Get in car" or "Get on bike".

or

Notification 1 (45 before appointment) > Custom message = "Grab materials" or "Review notes"
Notification 2 (10 before appointment) > Custom message = "Join call".