This I honestly don't know how to help with.
I've been to Gen con twice before, but I hear they've finished the construction work they were doing last year and a few of the spaces are different.
I feel like the Game hall is a good place for playing, but I have no idea if there will be available space anywhere long term enough for us to plan in advance. (Another thing I've heard about this Gen Con is that pretty much everything is sold out. You can't even get badges at the convention this year, except for maybe Sunday I think it was)
I know I see people playing all the time, but I have no idea where you could get a comfortable set-up in advance.
Of course, for Wednesday, this isn't a problem if we want to plan for that, because the vast majority of the people won't be there Wednesday. But then, I don't think we can techinically use any of the spaces, since it is set up for VIP people to do whatever it is VIP people do