Remember that business relationships are just that: relationships. You should be as interested in what they do, and willing to be of help if you can, as you want them to be in what you do.
Look as good as you can.
99% of making a connection turn into a sale is about being prepared. Be ready with a concise and interesting description of what you do. Don't perform unless asked; but be ready to.
You cannot seem like you need work; and you should not come off as if you need them.
Follow up! Hand-write each one a follow-up note about how much you enjoyed meeting them (keep it concise and in cursive, which is much more unusual/special these days). If specific dates come up at the meeting, get as much detail as possible -- enough to draft a contract. At the meeting, ask "well, I don't have my calendar on me, but there is a chance that I have an availability on that date. Would you like me to check and place a hold on that date if it is open?"
I still have a lot to learn but, so far, I've learned a lot by just going out and doing it. Whatever happens, have fun tommorow and look at it as a learning experience.
For future reference; a great book on this sort of thing is Jeffrey Gitomer's Little Black Book of Connections: 6.5 Assets for Networking your way to Rich Relationships; search Amazon for Gitomer.