The Mascone Center consists of 2 buildings (North & South). Last year a 3rd building was being constructed but I don't think it's finished yet. Apple's booth is located in the south building. Last year, in the area that I've circled in blue, there was a "ask the mac experts" section. This area had tables and benches along with booths that had iMacs connect to the internet. Anyone could walkup and use these iMacs. This seems like a nice place to meet.

We could decide to meet at Apple's booth since it's the easiest to find but I think it would be way to crowded on Tuesday.