Let me share a note from this doc: https://confluence.atlassian.com/teamcal/add-jira-events-241566244.html
Not within the calendar itself. But if you are displaying the calendar on a page within confluence, you can always add a link to JIRA for a specific project/issuetype. If you use the project/issue type that is being pulled into the calendar, it does the trick.
You can leave it as a simple link, or jazz it up with a nav button or image.
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