Historically, there was not an organized structure, with leagues sometimes overlapping and not officially coordinated.[2] In 2004, the league held the Las Vegas Summer League for the first time; it is by far the largest league, with 24 teams participating as of 2017. The Orlando Pro Summer League has been held since 2001. The Utah Jazz Summer League began play in 2015, replacing the Rocky Mountain Revue, an event held from 1984–2008 before going on a lengthy hiatus due to declining participation.