Sometimes calendar connectors come across issues after updates or crashes, and you may need to re-sync your calendar. GigaBook integrates with Cronofy, which links to Evernote, Slack, Trello and Zendesk calendar connectors.
In order to re-sync your Apple, Google, Outlook, Office 365 or Exchange calendar, follow the steps below from your GigaBook account.
Settings Hub>Data & Sync>Sync 3rd Party Calendar>Select "Manage" on appropriate calendar(s)>Permission>Select correct calendar connector>Re-sync