Follow the documentation here
https://confluence.atlassian.com/display/TEAMCAL/Adding+a+JIRA+Calendar
In the display option, select JQL (advanced)
In the query say
1. If you are looking to display all issues except the ones resolved as Fixed, type
resolution != Fixed
2. If not, to get all issues with the resolution field set to some value, type
resolution != null
and click OK
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