The best grades in the project result not from regurgitating things the professor says, but from teaching the professor and the rest of the class something new. Be quiet and never be conspicuous. If you do that everyone will assume that you never have anything useful to contribute. In business you are judged by how much you contribute to the group effort. You cannot get credit for it if nobody knows you contributed.
Classes are an opportunity to practice contributing.
We can always ask for an extension. You can ask, but you will not get it. Projects and presentations are scheduled around available times. The presentation cannot be moved because all other times are already booked for other groups. Not being prepared is an insult to the other students who are coming to learn from you.