It’s OK, the big libraries have booths in the post production section, so you can easily go up and talk to someone. The people at the booths are usually in sales, so chances are they’ll refer you to someone at the company that hires new composers. It’s also a good way to see what music is coming out from those libraries, and how the business works from their end.
Smaller libraries go there to meet potential international sub-publishers, so maybe you’ll bump into them too. Then there’s always the chance that you’ll make a great connection with someone on the broadcasting or production side of things, but that’s a bit of a crap shoot – most of the 1000’s of attendees aren’t in the position of hiring composers.