HELP - iCal on Macbook Air - all my Google synced entries have disappeared

OK. So this morning it's all resolved.

I see some people have clicked to say they have this issue too. It seems we are not alone. I also posted this on a similar thread on Google Calendar support - lots of people having the same issue - often multiple Gmail accounts, some syncing and some not. I tried loads of things - nothing worked.

Woke up this morning - refreshed the calendars one more time ... and sat and watched as all the appointments posted back again in Calendar??

Still none the wiser as to the cause of the issue - Google or Apple - but at least it's resolved itself which, along with all the other people posting on Google, implies it was a central issue somewhere, not anything on my MB Air. Unfortunately, if yours hasn't resolved itself, that doesn't help much.

One person on the Google thread said they fixed it. I didn't need to try their fix, but here it is for anyone who is stuck and wants to give it a go:

"I fixed the problem by exporting the given Google calendar in the web interface (top-right gear symbol -> Settings -> Select "Given Calendar" -> Export Calendar) => this saves an .ical.zip file => unzipping to an .ics file.

Then I imported the calendar again (top-right gear symbol -> Settings -> Import & Export -> Select the .ics file -> select the calendar name in the dropdown -> Import).

After the import completed in the web interface I refreshed the macOS Calendar App and all the events were synced ... 

I hope this is a permanent solution."

OK. Another update. My son has a virtually new Macbook Pro running the latest OS, and he has just had the same problem.

So, I went back to Apple support chat and told them this was happening on both machines and, surprise, surprise, they admitted this is a known issue (relief). Currently they think it's a problem at Google's end (they would, wouldn't they) but they are working on it, so we'll see. Apple tech support have just called my son to see if they can get more data on what's going on.

In the meantime, as I can't rely on Calendar, I've downloaded a trial version of Fantastical, which gets good recommendations and was really easy to sync with all my Google accounts. The trial lasts 3 weeks, so hopefully it's fixed before then...

I'm not at all sure any more. I just checked my Macbook Calendar and everything seemed OK. So I went onto my 4 separate Google calendars and added one entry - all appeared in the Macbook calendar OK. So I reversed the process, and the MB Calendar entries all appeared on the Google calendars as well.

So, it all seems OK, but I haven't had to add/change/delete much over the weekend, so we'll see what happens during the week.

Have 'spoken' to Apple Support via their chat - best they can advise is to upgrade my OS to Mojave. Although someone on the Google thread has two machines both on Mojave, and still has the problem ...

Some of my calendar entries have now come back, but not all of them. This is crazy.

Follow on a few hours later ... and the calendar entries have all disappeared again. I've tried the fix I referred to now, but it didn't do anything for me.

It really is bizarre. I tried the fix on one account, but it didn't do anything noticeable, and now a few hours later all of my accounts have come back again, even the ones I didn't try the fix on.