@sdetweil while messing with raspi-config over ssh, magicmirror lost connection to my wifi. I had to connect a keyboard and reconnect. But, before going back to your last suggestion I did two other things. I updated pm2 (as suggested by some other post). And in the browser console I noticed that I had an error about not being able to locate “CX3_shared.mjs”. I checked the MMM-CalendarExt3 repo, and found that file CX3_Shared/CX3_shared.mjs, which for some reason wasn’t getting pulled by a git pull. I manually copied it in, and the calendar sort of started working.
I should have paid better attention to the documentation, because I would have seen that I needed to run git submodule update --init --recursive
to update the submodule.
The reason I say “sort of” is because my family calendar doesn’t show some repeating events, but I need to dig deeper into that.
I really appreciate all your help.