I have found a couple, if you have anymore please let me know! I would love to hear what you think about each one of these. Are they worth it, a waste of time, etc.
- MIT Launch
- Social Entreprenuership at Stanford/Yale (Summer Fuel)
Try mysummeradvisor.com and look under Academic Programs. There is a section on business.
A good one is at Babson College. Babson has one of the best entrepreneurship programs in the U.S. It is located in the suburbs of Boston. It is pricey for a summer program, but they might offer financial aid.