The only thing at East Cobb that might fit is the 2010 Grad WWBA tournament at the end of June. There are usually a lot of scouts at the WWBA Tournaments here.
What about the National Pre-Draft Showcase in Cedar Rapids IA, in May?
There is also the National Academic Showcase in Jupiter in June. With his grades, he easily makes that cut, I would expect.
Good luck with whatever you decide. It looks like your son has a bright future ahead whether on or off the field.