Just from personal experience, the Perfect Game events are good to attend as a team. Check their website (perfectgame.org) for "team" tournaments. The granddady tournament for summer is East Cobb.
Also, there is a team down south of the Dallas Metroplex that puts together 5-10 specific college showcases. I believe the organization's name is The Saints.
Stay away from the Saints.. that stuff is a joke...
you want to be seen by college coaches? Houston Heat tourney, Houston Kyle Chapman tourney, Austin Slam tourney, Dallas Mustang tourney - probably the best four in state (summer events)....
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