I ran a program and served in a plenary panel at a major conference held at the McCormick. It's a huge hall with high ceilings, vast spaces, easy-on the ears acoustics, and plntiful supplies of low to medium quality coffee, Danish and sandwich options. For someone like me who has mobility challenges it requires WAY too much walking, but there are wheelchair and electric cart options, so no complaints. A gentleman on staff who gave me wrong directions because I asked him a question based on an inaccurate realized the problem and walked a full city block to find me and escort me to the right place: saved my day energy-wise and made me live the Center!