At this time, there is no indication of what is causing the error messages, or what people are doing in the meantime when their daily lives and work schedules are so dependent on Google Calendar. Is it unannounced maintenance from Google? Did Google experience some cascading hardware failure that lead to the service be knocked offline? Did Google experience a cyberattack that is affecting some systems?
Actually, there could be a simpler explanation. Yesterday, we reported on a new phishing campaign that is taking advantage of a vulnerability in Google Calendar to push notifications that prompt users to click through to tainted URLs. Google Calendar users are then asked to input credit card details and other personal information.
If this is actually a case of Google taking Google Calendar offline to address this issue, a little warning would have been nice beforehand.
When you are a programmer and everyone in the office thinks you can fix Google Calendar... pic.twitter.com/KKLdkoKZg3— Chuck Gaffney (@princetrunks) June 18, 2019
We'll keep this article updated as we wait to get an official response back from Google.