I agree with Vaniver about the time commitment issue. Even ignoring being able to find things for people to do for all that time, and accounting for burnout, and similar troubles, there remains the problem that ten weeks is a sizeable portion of someone's life. Most people, especially those who work during the summer, will have a lot of difficulty putting their lives on hold for two and a half months.

At this point in my life, I could not sacrifice a summer of job experience (and the money I would earn from that). I would be happy, ecstatic even, to attend something like this for one, maybe two, weeks, but ten is simply too much time. Running shorter workshops would also let you do some research, and iron out the wrinkles before you try something on this scale.

I appreciate what you're trying to accomplish, and it's a great idea, and a valiant effort, but I think you're going too big, too fast.