Not have anyone to talk to? You will have sorority members to talk to! Please girl, you have got to calm down. Give yourself a break and breathe a little. You have been posting so many threads hon, and coming across as desperate and insecure. This is not how you want the sororities to perceive you.
First, I doubt you'll be the only girl to show up alone. Second, the purpose of this event is to meet the sororities -- not hang out in a clique of girlfriends. Three, this event will most likely NOT be like walking into a night club by yourself! Sorority recruitment events are usually structured and organized to some degree, designed to encourage interaction between sorority members and potential new members. I don't know how your school will have things designed, but I really, really do not think Panhellenic is going to drop you PNM's into a pit of pandemonium or toss you into a "sink or swim, baby" scenario.
Get excited and enthusiastic about recruitment starting. If you truly feel that way, it will come through in your conversation, interest level and body language. If you see a girl walking towards the event by herself, or waiting by herself, strike up some conversation and maybe you'll end up walking in together. BUT -- it does not matter who you walk in with or walk out with.
What matters is what takes place inside, and that will be meeting sorority members, not giggling with girlfriends
You seem to be letting your fears morph into the big bad monster you think is under the bed -- and isn't. Stay focused on what the event is about, and that's meeting the sororities. Is recruitment pretty structured at your school and are PNM's put into Rho Chi groups? If so, you may actually be getting your group assignment tomorrow night --viola! Instant people around you.
And ask yourself this: if I go to recruitment by myself, what is the worst thing that could happen? I think you'll see this is not a life or death circumstance. If your fear is that you'll end up in a corner by yourself, well, that will only happen if you choose it. Remember, you are going to meet sorority women...so meet them. And remember, they are there to meet you too!
No, don't show up real early and do not show up late at all. Get there on time, and by that I mean about 10 minutes before the event starts. Calm down, have fun and good luck!