Google Calendar and third-party software
We've found that some third-party firewall software, pop-up blocking and ad-blocking software, and browser plug-ins can interfere with your use of Google Calendar. If you believe software installed on your computer is preventing you from using Google Calendar, we suggest adding "www.google.com/calendar" as an exception to any ad-blocking, script-blocking, or pop-up blocking rules. If that doesn't help, please disable the software, clear your browser's cache, and log in to Google Calendar again.
If you're still having trouble accessing Google Calendar, sign in at https://www.google.com/calendar (HTTPS) to see if you can access your events.