Taking a blind guess because there's so little information here. Maybe this is related to the recent troubles with Google authentication.
https://bugzilla.gnome.org/show_bug.cgi?id=771547 Are you using Unity or GNOME or some other desktop? Was your calendar in sync with Google Calendar before? As a workaround, please try restarting your computer. ** Bug watch added: GNOME Bug Tracker #771547 https://bugzilla.gnome.org/show_bug.cgi?id=771547 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-calendar in Ubuntu. https://bugs.launchpad.net/bugs/1633053 Title: gnome-calendar 3.20.4 inoperable after update on 13 October 2016 Status in gnome-calendar package in Ubuntu: Incomplete Bug description: Calendar 3.20.4 has no data showing. It is a blank calendar. All my data seems to be erased. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-calendar/+bug/1633053/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
