I'm not saying anything will happen at this Year's conference, but I have been told that in the past there have been some companies that conducted interviews on-site.
I've been told to wear interview suit for the conference, business casual for the evening.
Plus, I was told to bring plenty of resumes, plenty of resume paper and bags for swag.
On my own, I'm bringing original copies of recommendations, my logbook and other pertinenent paperwork.
Again, NOT saying there will be anything more than pilots at booths representing their company, but it's also a job fair-like atmosphere, so I'd be prepared.