I've been wanting to go to Oshkosh ever since I started flying some eight or so years ago, and finally will have the opportunity to go for a couple days this year. I'll be heading in commercially, don't have an airplane to use for the trip. If you only had two days (and evenings) to spend there, which days would you recommend and why? I'm open to everything, from exhibits to airshows to seminars and concerts. My first thoughts were either the opening or closing days, but those are just WAGs.