Tendenci allows you to edit the standard registration form for events. This lets you capture more targeted information for event registrants.
To get there, click on the Admin Backend in the Quick Links dropdown.
In the Admin Backend, click on Standard Registration Forms to edit the form.
From the Standard Registration Form screen you can select the fields you'd like to have your event registrants fill out.
Be sure to click Update once you're done editing your form.
Making changes on this form edits the information that an event registrant inputs after they've clicked Register for an event.