Probably 75% contacted us first. The one my son ended up obtaining was one that we contacted; however, they told us that they would have contacted us 60 days earlier but were "told" that he had already obtained an advisor.
I really don't remember how some of them got my son's name. One or more of them was through a relationship with my son's select team or maybe even a college coach on an unofficial visit he took.. I "think" some just saw him pitch somewhere. I know that after my son obtained an advisor, I saw some of the ones he didn't choose at subsequent events. Maybe they had advisees there or maybe they were still fishing for new ones.
As to initial contact, I think that I got an email or telephone call or snail-mail from the ones that I did not contact. I will ask my son and wife and see if they remember.