1. Firms WILL look through the attending list to see who showed up and who didn't. If you didn't even bother to come for an hour and a half (and free food!) then are you genuinely interested in the firm?
2. If you can't make it for any reason, e-mail the school recruiter to let them know! It'll leave a positive impression as someone who is organized, professional, and interested in the firm.
3. As one consultant put it "It's much easier to stand out in a bad way than a good way at an information session". During one of the information sessions I attended last year, a student asked a consultant if their firm solved problems through a "chaotic approach".
Another showed up with a cast on his arm that had "Firecrotch" written on it in big black (or was it red?) letters. Be careful about the things that you say and do as the assumption is that you would present yourself to a client the same way you are presenting yourself to a firm at their information session,
There's a long section in the '6 Steps to Success' about the information session networking process, so register to check it out (if you haven't already), just wanted to add on a couple of new tips.