You might care to look at my comments on this year's show on http://www.whodoyouthinkyouaremagazine.com/forum/topic12908.html
- essentially, you should take care where you sit in any of the talks, because the "theatres" are pretty much open so the spill-over of sound from other sessions can be annoying. It's unlikely that any seating position will solve the problem but some might help.
Plan who you want to talk to and which stalls are must-visits.
Wear comfortable shoes and if you need to eat at the same time as everyone else, don't stand on your dignity - just sit on the floor if there's no seating!