Maybe some driver time? You may already be demonstrating robot functions throughout, but it could be beneficial to help show that you should keep robot controls in mind throughout the design process... that, and getting the chance to drive the robot is always an attention grabber (for us at least). I feel like getting a good feel of how the robot runs (sensitivity, speed, etc.), from the driving end, can transfer into knowledge that can be brought back to the table during future mechanical design. [I'm mostly saying this because I drove our 2K11 robot for the pretty much the first time at an offseason competition and may have had a few epiphanies...
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Or maybe you could throw in a few quizzes on tools! (We do some "over the top" ones for pit crew training- usually very fun).
You look like you already have a lot covered though (great job)!