We do yearly assemblies to the divisions of our school. I presented ours last week.
We focus on the accessibility of robotics (no prior experience necessary), the experience (the competitions, the trips) and the bonds that we all share. The most popular part this year was shooting soccer balls at the student body president.
We did find that we had a spike in participation when we started winning awards. While that may seem shallow, I think it picks up on a broader theme that if you highlight the successes of your program, and people see that you are confident and proud of what you do, then they are more inclined to join.
We finished with our team captain speaking about what robotics did for him, as well as showing an assembly video. I'd advise against showing your chairman's video, as the audience for the chairman's is much different than people who have never done robotics before.
Our assembly video can be seen here:
http://www.youtube.com/watch?v=eSYkBJ14m_Y
and last years:
http://www.youtube.com/watch?v=wU3A-QCweqU
(Can you see the difference a dedicated video department brings?
)
contrast that with our winning chairman's video:
http://www.youtube.com/watch?v=IxPoc...eature=related
Hope this helps!