pino,
I would go to the camp if it from a school you are interested in.
TR is right you will be attending a "clinic" or "instructional camp" on those three Sundays.
My son has did one last year and will be attending one this year, maybe the same one you are talking about. (in Cherry Hill, New Jersey?)
At that camp about 10-15 coaches come in each Sunday and instruct on hitting and/or pitching.
At the same time they are "instructing" they are obviously watching and looking for talent. Last year there was about 50-75 kids per session at the camp and they rotated through stations.
If it is the same camp you are attending you can send me a PM and if you have any questions.