Your Google account must be connected to Jira and the Google Calendar integration must be enabled.
You can open an event in Google Calendar from a Jira work item to view or edit it.
To open an event in Google Calendar from Jira:
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Click the event title or click the menu on the right and select Open in Calendar.
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In the dialog that appears, click Continue to open the event in a new window.
Users will only be able to access calendar events that their Google account has the right permissions for. See the Google Calendar integration FAQ for more information.