Hi Ann Marie,
Unfortunately, it turns out I may have misled you there. I had thought the table might be generated in a similar fashion to a WP Posts List Table (like the list of events, posts or pages, etc) and so the columns would be filterable.
In fact, in the case of the attendees list table, they seem not to be filterable. But I’ll definitely add a feature request for this and see if we can have a filter put in place in a future version – and of course adding the attendee name is already a current feature request.
Apologies for the confusion!