[leonroy]

> The calendar notification is very random. Sometimes it fires, sometimes it does not. I have missed couple of meetings because notification popped after the meeting was over.

I see something similar and assumed this happens because Mail / Calendar are relying on ics attachments (not sure what the behaviour is with the Gmail integration). I believe this means that if Mail is closed you don’t get Calendar updates until you open both and refresh.

Either way I find I have to refresh Mail and Calendar a lot to keep them in sync.