I doubt that was it because I’d unchecked the Calendar sync option in iTunes, but it could have left a glitch behind. However, I’ve been burned a few times by Apple changing things so I’m leery of changing. As I said to Simon in a reply yesterday, I’ve found that enabling syncing of selected calendars in iTunes then using the replace option in the Advanced section seems to work. Once I had Calendar.app on my iMac cleaned up (it took several days to find all the dups & figure out how to eliminate all but the original), doing the replace action took care of the problems on my iPhone & iPads. I think for now I’ll leave well enough alone. My iMac is a mid-2011 and is limited to High Sierra and iTunes 12.8.3 so I’ll wait until I have to replace the iMac and revisit my options then.
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