A few days ago, something broke with Google’s calendar synchronization as it works in macOS and iOS. Complaints abound on Google’s support forums, but no solid answers have emerged at this writing.
Many people have tried a variety of techniques, like changing events, removing cached local calendar data in macOS, and other tactics. None have worked, or only work briefly before the calendar disappears again.
We’ll update this article when a solution appears. But never fear: It’s not just your account or device.