Before your live event, you may want to allow customers to preregister. By putting your event in preregistration mode, it will be visible on your site and will allow customers to purchase access to the event in advance.
Navigate to the live event you want to enable preregistration for under Content > Live Events and click Edit. Under the Stream tab click the Preregistration button.
The event will then appear in your catalog with a countdown clock as the video preview.