The fix was embarrassingly easy- Clear Data in Calendar and Calendar Storage. I found detailed instructions here for another calendar app:
Problems with Google Calendar Syncing . The sync restarted immediately (in Optimus V time
and appointments which disappeared reappeared as I watched the beauty of operational Sync ronization!
I have number of individual calendars which allows for color coding by appointment function, which I suppose eats up the scarce phone memory. I've been thinking of dumping all of them back into one, but I'm more likely to remember this bug and fix when DST changes next time. Bonus: my daily one line temp forecast has returned, too!
My next challenge is to optimize phone memory, so I can run a music/radio app I had to deleted when getting the Low Memory warning. I have downloaded a measly 8 apps outside of Google "essentials", just 2 were okay-ed to run on SD card
.