[JimWright949]

This is an interesting question. A rolling robot would be cool and it would gather people around it where ever it drove, however you may look at a stationary robot, such as an arm.

The arm could hand people business cards. If a person took a business card it would recognize it and reach back to the stack of cards and select another to hand to someone else.

If no one took a card, it could get 'bored' put the card back on the stack and move a few other objects around the table for a few minutes and then go back to handing out cards.

The display behind it could explain the control loops and systems of the arm, such what type of sensors you are using, what is the gear ratio, and how you chose the sensors and ratios.

I'm part of the Seattle Robotics Society and every year we have a Robothon. Having a little Lego/Vex robot running around the floor attracts people who you can then send to the booth for the heavy information is. One of my favorite displays that we have had in the 8+ years of doing this was a Rubik's Cube solving robot that was stationary.

-Jim