First you will need to get to the content page of the existing asset.
If you know the ID or what the content was named, you can search for this in the main content tab.
Make sure the ‘State’ filter is set to ‘All’ to find any archived content.
Once you find an archived asset, click on the ‘Restore’ button.
From here you should be able to go into the asset and link it to new events.
If there are no longer events attached to this asset contact MKTG.