I went last Tuesday with the Plaza viewing. Parade was at 8:45, and I think we were in the area about 7:15-7:30ish. They had not yet opened the viewing area (roped off but not letting anyone in). Despite being early and getting in right away, we got one of the last curb spots. I sat on the curb between 2 families and my Mom was behind me in the wheelchair. The CM on our side was significantly slower than the one on the other. People who arrived later were much further back, including some who were all the way back in the circle close to the flag pole. So definitely get there early!