1. Yes, most generally attend all three days.
You'll find either keynote sessions or breakout workshops (dozens) each day to keep you interested.
2. There is some general activity each of the main evenings (Mon, Tues, Wednesday), with more of a social aspect.
3. Both management and techy, a very good mix -- I'd say more tilted to the techy BES Admin direction.
Tips? If you don't know others who will be attending, check back in here a couple weeks before traveling and make some arrangements to meet up with others you'll find in this WES 2010 section of the Forum.