Once you have successfully created an event and need to run a report for the registered attendees, you'll need to access the event using the "Manage Events" tab from the Officer's Only section, then select your event and click on reports under "Action"

The reports page will provide the appropriate reports, based on the type of event you have selected.

Here is an example of what you may see:

Click on "Registrant Roster" to display the report of attendees.