Enabling the Who's Coming List on an event is a great way to generate additional registrations for an event. However, no one likes to be the first person to register. The flexibility to enable and disable the 'who's coming list' is key.
Wait until 10-15 people have registered for the event, and go to Forms > Build > #3 Event Registration > Event Options to enable the 'who's coming list'. Adding an additional custom field to display in addition to First Name and Last Name will also help to drum additional registrations.