I can definitely echo KathieK's sentiments. We recruit students from everywhere, including the people you'd expect (computer geeks, gear heads) to drama kids, band...our team members come from all kinds of students, not just the typical image of a "FIRSTie"
Definitely show off your robot at that event. Invite everyone to drive it. Try to match the excitement of a FIRST competition the best you can (i know its impossible...but we like to make everything a party
)