The event was part of a small but growing trend. This week, for N.B.A. team officials’ benefit, Nevada-Las Vegas will hold a practice expressly designed like the N.B.A. scouting combine. Kentucky, a team that produced four first-round picks last year — three of them freshmen, including the top pick, Karl-Anthony Towns — had its N.B.A.-geared practice shown on ESPNU this month for the second year in a row.