What I did:
Created Reminder in Reminders with no time associated with it.
Reminder showed in Reminders, but not in calendar panel of Agenda.
(Reminders with times do show in Agenda)
What I expected:
To show in calendar panel of Agenda, before or after timed events and reminders.
Things that might be helpful to know (Agenda version, OS and model, etc):
9.3.1, MacOS 10.15.3