How to prepare for a graduate school fair? My school is offering a graduate school fair in one week, and I am interested in graduate school. I am already planning to take my Biology GRE as soon as possible, but not soon enough to bring the results to the fair. So, how should I prepare myself for this event, this being my first time at one? 

Background info:

They state that there will be recruiters there, so I assume formal/semi-formal attire. But do schools really even bother recruiting for graduate programs at these events or is it more of a general advertisement/ tour? I also assume bringing my CV would be smart, but my GPA is not stellar ( 3.0ish at lower-end school), so would that leave a bad impression or no? 

The "nail in the coffin" for me is my indecisiveness in what to actually study in biology. My advisors often tell me to only consider graduate school if you have something you are really "passionate" about. I never really felt "passionate" about biology or any subject though, I simply liked it better than others and found it cool. I have done so much in my undergraduate studies that I have liked, such as working in a greenhouse, to doing undergrad reserch in genetics, it is hard for me to set my heart to something. 

This is all assuming I could afford to attend grad school without sinking myself further into debt, given I have no more financial aid or federal loans left to my disposal. I have read that some people get "free rides", but those are few, far between, and for the very gifted/focused students I assume. Thanks for your time.
A grad school fair is not quite like a job fair, where many people bring CVs and hope to get interviews---no one is expecting you to apply to a grad school at a fair.  It is a place for you to go to learn about grad schools: what programs are out there, what they are like.

As for how you should prepare: think some about what you might like to study and what things would be important to you in choosing a grad school.  For this, it may be helpful to first try to find general advice on choosing grad schools.  Then you can ask appropriate questions to each program.