Hi Nicole,
The Email Event has a field for URL. This URL does include the specific URL that they clicked on containing their unique ID. What you can do is create an advanced find for Click events where the 'URL' 'contains' the base link such as "http://domainname.com/news/open-day".
You can also use the Click Report to see a list of people who clicked on each link. Here's an article about where to find that: http://help.clickdimensions.com/email-send-click-report/
Thank you for using the forum!