I went to the Pennsylvania Convention Center over ...

I went to the Pennsylvania Convention Center over four days with 20,000 others for the World Meeting of Families. It is a meeting of Catholics from all over the world that ended with a visit from Pope Francis.
This is a huge Convention Center, stretching the city blocks from East to West and then an off shoot at the eastern end that goes south for one or two blocks.
The convention center has a huge room where the full sessions were held and had no problems holding the large crowds with seats to spare. The building temperature was perfect with such a large crowd. There were enough bathrooms that there was never a long line and enough escalators that there was never a wait.
The convention center struggled was bottle necks. The hallways leading from one ballroom to three next were simply not wide enough to handle everyone moving in one direction at the same time, and even worse when a couple people were going the other way. The other struggle was with wifi, it simply couldn't handle the number of people using it. Streaming anything was impossible, even loading a website took forever. I finally ended up disconnecting wifi and using T-Mobile, which worked great.
Overall, the convention center was great, it just struggled with having such a larger convention that had everyone in one place going in the same direction at the same time. Once you got past the bottle neck, it was very easy to get around. I don't think they can fix that, but wifi must be updated.
Overall, I'd be happy to attend another conference there.