Hey there, Ed.
You can try seeking the advice from Atlassian Experts (http://www.atlassian.com/resources/experts#find-an-expert) in order to perform customization on the Issue Calendar if the feature is not available out-of-the-box (https://marketplace.atlassian.com/plugins/com.atlassian.jira.ext.calendar)
Hope this helps.
Warm regards,
Danial
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