***This issue was resolved before 8.30AM****
Google Calendar is down worldwide this morning. There is no ETA for restoration. You may be able to view an out of date cached version of your calendar on your mobile device.
You can follow the Google status page for this issue here: http://www.google.com/appsstatus#hl=en&v=issue&sid=2&iid=847490285bf1b9e082a699bafb95f53b
