I somewhat disagree with the other coaches here on the use of the CV. but come the same overall recommendation on the need for the CV to be stellar and well-prepared.
The CV needs to be stellar for you to get the invitation to the career event. And the career events are often a first step to an interview application. If you leave a good impression, you'll get a fast track to the interviews for a full time position. This means that these career events are high in demand and competition is fierce. You won't get the spot without a well prepared CV.
But if you decide to apply for a full time position you will still have the chance to submit a new CV, as often also your profile will have changed by the time you get to the full application.