I was filing the other day and came across stuff from several years ago. My son goes to a MCPS which has a program for kids with physical disabilies. They sent home a flyer for the camp. I think it was Project Discovery.
http://montgomerycountymd.gov/rec/thingstodo/therapeutic/camps.html
I don't know anything about it, but if if is co-sponsored with MCPS, so I guess you have to be a MCPS to attend. I guess you could still call and find out about it and if your child doesn't go to school in MCPS, maybe they have some suggestions of where else to go.