I went last year for the first time and compared to NYCC it was not crowded but of course a lot less things to see and do. Even the boys panel was easy to get to and I think no one was turned away. I didn't know that being turned away was a possibility, it didn't seem so to me just comparing the amount of people. I was actually able to walk without having to squeeze by others but maybe that was just because it was still close to COVID times last year? I don't drive but there a many garages in walking distance so while the closest may be full you will have other options like Providence place mall or a garage next to Marriot which is not far for someone I assume is used to city blocks distance