A couple of days ago (Oct 16th) - Lightning calendar got repopulated so that is nearly back to normal. Presumably because the quota was increased.
But the fault originally specified in this thread remains. I am not able to dismiss event reminders, nor put them into snooze, nor edit them. This only happens with some events - others are fine.
Here's some of the Error Console messages:
[JavaScript Error: "[calGoogleCalendar] Missing ETag for Ical8b0cbc28a4004ba553216c26346a3263#20141017T170000Z#187705f3-80f4-4ea6-ab69-285d71c1b486"]
[JavaScript Error: "[calGoogleCalendar] Modifying item June sugar level failed:
2152334338: [object Object]"]
[JavaScript Error: "[calGoogleCalendar] Missing ETag for Ical8b0cbc28a4004ba553216c26346a3263##187705f3-80f4-4ea6-ab69-285d71c1b486"]
[JavaScript Error: "[calGoogleCalendar] Modifying item June sugar level failed:
2152334338: [object Object]"]
[JavaScript Error: "[calGoogleCalendar] Missing ETag for Ical8b0cbc28a4004ba553216c26346a3263##187705f3-80f4-4ea6-ab69-285d71c1b486"]
[JavaScript Error: "[calGoogleCalendar] Modifying item June sugar level failed:
2152334338: [object Object]"]