I have been 3 diff. years but not going this year. I always wear something cool as the bldg gets rather warm by mid morning or by noon. I wear the most comfy shoes I have and I also have a pr to chg into if my feet get to hurting. I go to the Hotel and dump pkgs so this is a great time to change shoes. Helps with foot & leg pain. I take a huge mesh bag with my drivers license, credit card and dollars. Also some Aleve or something for pain shpuld i need it. Going as light as you can will help tremendously. I bought landscape fabric from Home Depot or Lowes and amd ea mesh bag out of that. Used some nylon webbing for handles. You will have a great time! Just go light.
edited to say that I take 2 days to just shop. If you visit ea booth, it takes a long time. Another day to see all of the exhibits. Then classes? I haven't done those.