TAR
Lets put it this way-- if you call the college in question and tell them that you are playing those two days , can I visit on another day--after all your son is a junior and it is an "unofficial" visit --- what do you think the college coach will think?--He will think highly of your son for thinking of his team first and the coach will find another day to visit. "unofficially".
Harm done--who knows?--- the HS coach may give his blessing but what about the kids on the team-- what will they think????
If you have an alternative method --I say use it
JMHO
TRhit