Regardless of which of the better (academic) showcases you go to - Headfirst, Top 96, Showball, the coaches should have had your name before you get there. Your meeting should be based on some other solicitation on your part (filling out a questionnaire, send video, e-mail including transcript or board scores, etc, phone call, etc). You have a list ahead of time as to who is attendance. Try to get on the coach's clipboard before the event. and indicate what feild, team number you are on. Remember you are the one creating the opportunity. You are up against several hundred players at the events.Taking action before the event moves separates you from the throngs of players that approach certain programs.
When exactly is before? One week, two weeks, two days before the event?
Another related question I have is, how far in advance of a casual college visit (i.e. you happen to be in "the neighborhood" of a college of potential interest to your son) should your son try to contact the baseball coach to see if he is available for a few minutes that day?