No events show up in the calendar…

I?m not sure what to think of this plugin.…
The Installation and setup was straightforward (it’s complicated, but there are very details step-by-step instructions with screenshots on what to do and they are up-to-date when comparing with Google developper’s page), but after installing it, no matter what I do, it stays desperately empty… ??

My calendars are synching everywhere but here. Also, there’s no week view. That’s a shame…