As others have rightly said, most passengers don’t know the difference between an A-320 and a 737. Those that do, probably know enough to make an informed decision about flying the MAX. The more hoopla you make about it, the more people will get all worried and want to change. Just board the passengers and take off. If someone decides they don’t want to fly it, book them on a different flight. In two weeks it will be old news.