The idea of the science fair would be really good. Because the only thing I was ever interested in at Innoventions was the Sum of All Thrills. All the other "exhibits"/games were so basic that even most children would be bored. And none of them really show the future of technology. In actual fact, a lot of them are now rather outdated.
So if Disney could create an environment which caters to the little kids with the appearance of BH6 characters and also appeals to the intellect of secondary (high school) level students to inspire them to pursue a career in science. I'm talking about robotics, nanotechnology (both of which are in the film), chemistry experiments (e.g. showing the properties of different chemicals, maybe a few more advanced pracs for school groups), you could even have Baymax talking about recent developments in the medical field!
Also, it would be a great way to attract uni/college students studying medicine/science/engineering to enter the College Program, as they could take an active part in encouraging growth of learning in these sectors. And also because anyone who wants to find out more about the demonstrations afterwards could talk to someone who actually knows what they're talking about (similar to animal keepers in Animal Kingdom).
Wow... I ended up writing a lot more than I intended...