Note: I work on the platform team at Eventbrite
Currently there is no way to search for a specific attendee with event_list_attendees
.
However, you can cut down on the amount of data returned by paging through the results until you have found the attendee or using the modified_after
parameter if you know when the user was last updated: http://developer.eventbrite.com/doc/events/event_list_attendees/
I realize this limitation is non-ideal. We're actively working on building a new API which is more RESTful and does not have issues like this.