You can see what previous events a contact has attended by following these steps:
Click on `Home`
Click on `All events`
Click on your Workspace
Click on `Contacts`
Click on `List`
Next to the name of each contact in the contact list, to the right, coloured dots will appear representing the events that person has attended in the passed.
Hoover the cursor over the dots and a list with the names of events attended will appear
If you click on the contact you can see the list of events that the contact has attended with clickable links to their status for each event under Events attended / Tickets.