I registered at several sites but they will notify you to set up an appointment when the time is available but if you don’t set up an appointment they will move on to the next person.Let’s say you register at a bunch of different places . Then you finally get a vaccine appointment. How do you take yourself off the other sites ? Seems like this will logjam the system staying on all the other lists. Because those places will eventually contact you, and hold a place for you to a certain point . Seems like a massive waste of time and inefficient when you add it all up .