I've read that it's turf, no reason to keep people off it and unless they fence it, they couldn't. I think it's wonderful to have an open place you can sit that's not concrete. From the pictures I've seen during fireworks, people are sitting to view and with the angles, their views aren't really blocked by others outside the ares. I also like what seems to be a great many ledges around the fences outside the fp+ viewing areas that would appear to have space to sit.