I'd done that and even did a stand alone view of just that calendar without any luck. I'd even tried deleting and re-adding last night.

I just deleted the calendar and tried it again from scratch. It seems to be working now, so perhaps it was a cache issue somewhere between the site software and Google Calendar? Maybe a glitch on the edge of having no events in the subscribed calendar and several events in there now?

It will be solved by "allow cookies" for me. However, I can't reply here, so I reply & note by hypothes.is.

cf. The "Change your cookie settings" section in this website: https://support.google.com/chrome/answer/95647?co=GENIE.Platform%3DDesktop&hl=en