Oh, goodness. There are horror stories. Editors hiding in the men's room to escape authors with manuscripts. Authors following the editors into the men's rooms to give them their manuscripts.
No, you don't have to to the Used Car Salesman thing.
Editors don't want to go home with six hundred pounds of manuscripts in their luggage. If they're interested in something you've written, they'll ask you to send it to them at their work address when you get home.
So, how do you get them interested? By being yourself. Talk about what you're interested in. Be interesting. If someone remembers you as the smart, funny guy who could hold up his end of a conversation and paid attention to what others thought and said ... that's good.
You might carry business cards. What does a business card have on it? As little as possible. Your name and contact information, and the whole back clean, white, and blank to write down the subject you were just talking about. Get their business cards, and a couple of days later, drop them a note saying, "I met you at _____ where we talked about ____. Is _____ still open?" or whatever. Business cards are not laser-cutout, embossed-and-foiled, full-color representations of what you'd like the cover of your first book to look like, with your name in 36-point Post-Crypt font printed in scarlet enamel under the step-back, with instructions for making a working origami helicopter printed on the back.
"Hey, how's it goin'?" will get you a lot farther than "Let me tell you about my booooook!"
Be yourself, be natural, be interested in others, be interesting on your own, and listen to the shop-talk. You will learn much.