There are two problems with that idea. One: the LDC projector isn't very bright, and the lobby area has a lot of natural light streaming in from the windows, and the ones up high can't easily be covered. Two: we only have one sound system (and one mixer to plug the mic into), and it will be on the stage.
So if we do a presentation in the lobby, you won't have a microphone, you won't have a sound system, and you might not be able to see the output of the projector.
This might work for something like an optics cleaning seminar, since it would be a small group and it's mostly hands-on anyway, but I know that both Bill Benner and Patrick Murphy have presentations planned that will require the LCD projector.
Adam