I installed evolution and evolution-calendar on a Raspberry pi 400 running trixie, wayland, labwc

I then added multiple calendar entries in multiple local calendars. I do no external syncing with other calendars.

I configured evolution preferences for calendar Reminders and checked the following boxes:
Display Reminders window with notifications
Keep reminder notification window always on top
Enable desktop notifications
Display reminders for completed tasks
Display reminders for past events
Set default reminder 30 minutes before

For the sources for reminder notification, all calandars are checked

After realizing I was not getting notifications, I set up an event for test purposes with a 5 minute notification and repeatedly changed the time after it occurred so as to try again. Each time, I heard a notification bell ringing but no notifications ever popped up.

My other system runs Debian bookworm on a laptop using X and I installed calendar there for test purposes. Notifications always show up.

Unfortunately, I made a dumb mistake. I was not using evolution-calendar but Gnome-calandar. I have since verified that Evolution calendar notification does indeed work.