Started in 1971 by Lloyd Williams and Vertis Sails to give inner-city Memphis players a competitive stage. Began at Melrose with nine teams. Hamilton High became the permanent host in 1992; girls divisions started 1993, middle schools 2009. 50+ years running.
National Prep Tournament in Fort Walton Beach, Florida takes both high school and post-grad programs. Applications stay open through October 31. If you want a competitive early-March slot without invitation-only barriers, this is the one to apply for.