I was most interested in the large scale but personal events, like the "paint and take" minitures thing and the gaming library (I know that's not an event perse but it sounds like fun). Those sound like fun but what I really want to do is just check the place out. Hit panels, wander the halls, go through the underground tubes and follow them back into the hotels, try and crash into other people's pick up games or grab some space a start one of my own, all that crazy crap.
I just want to have a rough plan so I don't get rolled under and crushed by the sheer size of GenCon, which I've heard is one of the big threats.