Brown was last a member of AAU when he was 13. Looks like something may have been going on when he was 8. He is shown affiliated with a Houston team. For the balance of his years he is registered in Alaska or Washington.
If club teams are not playing in NCAA certified events, or AAU events...
Mac Irvin Fire is a shoe company team. They have not participated in, nor been a member of the AAU for several years.
As far as the 2 players from Wisconsin, the NCAA allows youth teams playing in NCAA certified events to have 3 team members from an adjacent state.
The NABC (National Assn of Basketball Coaches) holds its Convention in conjunction with the Final Four. A lot of coaches do attend for the Convention. Not all stay for the Games.
Some Pro Day results posted here. NU's are not. Don't know if they will be posted later?
http://www.nfl.com/news/story/0ap3000000789058/article/2017-nfl-draft-pro-day-schedule-and-results-by-school
NCAA rules state that the home team wears "light" and visitors wear dark. This can be altered by teams' mutual consent. I assume these same rules apply during the NCAA tournament?