Where are you located? We would love to come and help you. My team members have experience teaching other kids about programming, and we would be happy to spend an afternoon with you some time over the summer. If it doesn't work out for us to meet in person, or if it is too far for us to come, we could set something up over Skype. We live in Harrisonburg. Let us know! We would love to help.
Also, there are some great programming opportunities over the summer that your team members might be able to participate in. In Harrisonburg, we have several camps through the Learning Can Be Fun summer program at our local community college, Blue Ridge Community College. Last summer, JMU offered an advanced robotics programming camp. I haven't heard yet if they will be offering that again, but I am sure information will be posted here. Shari Robinson's team in Richmond, the Lord of the Bricks, recently posted here about some summer workshops in Richmond.
Let us know where you are located, and maybe others can chime in with summer camps in your area.
Coach of the Brick Dawgs, the Robots Who Say Ni (FTC team) and formerly, the Nanobots!