Pine Bluff. Founded 1982 by banker Travis Creed and revived in 2018 after a long gap. Roughly half the field is Arkansas schools, half national invitees. Hosted the first regular-season high school basketball game on national prime-time ESPN (1987).
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.