I'd be happy to help man the booth and I'll be available for planning and whatnot as much as I can. I'm guessing there are lots of completed projects that members/regulars would be happy to show off as examples of what we do. Our Robothon robot (and yours) come to mind as well as random 3D-printed and laser-cut gadgets and do-dads that people can play with.
I've volunteered there since it started in Seattle and from what I've seen, anything interactive gets lots of attention- music and lights in particular. Kids really love robots or anything else they can control but charged batteries are a must. Contests/raffles/give-aways are another good method and it's a great way to get people on a mailing list, of course.
I think stickers are a great give-away item. I have them plastered all over my shop from previous Maker Faires and it's a good reminder for websites I want to look up occasionally. There are thousands of attendees now, so we would probably need a lot. Laser-cut business card-type items would be cool, but might not be very practical for everybody who comes to the booth. Maybe would could make a bunch just for people who seem very interested rather than having them as a "grab and go" type of thing.
Those are just some thoughts, but I look forward to having a planning meeting of some sort. It's a fantastic way to get exposure for our space and a lot of fun to attend.