Agree with others comments and agree with your decision not to attend HF until you have ACT/SAT scores in hand. HF is an excellent showcase, and like no other we attended many years ago. Regardless of their motivations for emailing you information, it Is important that your son understand the academics are just as important as the baseball where most HF schools are concerned.
If you aren't sure exactly what to expect at a HF showcase I strongly encourage you and your son to read some of the most recent postings on HSBBWeb, and ask questions before investing the $1K and attending.
Good luck!