After the conclusion of a ticketed event, you can go back to the list of recipients and update the attendance status for each of the guests to denote if they did or did not end up attending that competition.
Go to the Department -> Complimentary Tickets page and click into the Event. You will be defaulted to the Tickets tab where you can go in and select those ticket recipients you want to update. Once they are selected you can click the "Update Attendance" option from the action menu in the top right corner of the list.
You can choose to mark the guests as either Attended or Not Attended, and the grid will be updated accordingly.
Once everyone is updated you can utilize the Attended facet to filter down to only those who did or did not attend the competition in case you have any follow up correspondence you need to send out.