Can I recover deleted Outlook 2013 calendar items? 

Yes it is possible to recover deleted 2013 calendar items but there is no in built utility to recover deleted enteries in out look.

you can try a third party utility : http://www.datacarelab.com/software-for-outlook-pst-file.php

It also shows the preview after scanning.

Hi,

Before trying any 3rd-party tools, make sure you have checked the Deleted Items.

Restore deleted items in Outlook

Regards,

Melon Chen
TechNet Community Su