Some scheduled tasks require reminders, others don't. In this schedule:
* Schedule 9:00 | 12:00 | Read Simmel's Philosophy of Money @12:45 Do Something Else @13:00 | 14:00 | lunch @14:30 | | Meet jrs to discuss his dissertation @16:00 Test Society seminar 18:00 go home
those that have an @ prefix will be added to the appointment reminder list; the others will not. The formats that are recognized are fairly flexible, as you can see from the example.
If you change your schedule, you can update the appointment list with
M-x planner-appt-update
You can also have the schedule sorted as part of the update, if you have this in your configuration:
(setq planner-appt-sort-schedule-on-update-flag t)
You can also have cyclical schedule entries(see Cyclic Tasks) if you add
(planner-appt-schedule-cyclic-insinuate)
to your configuration.
If you put an entry in your cyclical task file like this
Friday @12:45 | 13:45 | Staff Meeting
then it will appear in your schedule every Friday, and an appointment alert will be set up.