I would take the "we" out of that statement and plan to say hi. Let your son stand on his own. I have heard many coaches complain about helicopter parents in the recruiting process and how awkward it is to tell parents to go away at a tournament. They hope they know better.
Thanks for the reminder! This was exactly what I did at the winter national, hiding behind bushes. He introduced himself to a couple of coaches. At Kalamazoo, I did say hi to one coach because we already met at his campus showdown.