You can add events and people calenders to team calenders in Confluence at will - see https://confluence.atlassian.com/display/TEAMCAL/Adding+a+People+Calendar
I beleive you can also accomplish this using timesheets from Tempo: http://www.tempoplugin.com/products/tempo-timesheets/#section-price
I notice you mentioned 'import' in the original question - were you looking to import data as well from calenders?
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