The league planned to continue in 2004 , but that year 's Democratic National Convention was being held in Boston , and as a result hotel rooms were scarce . Warren LeGarie invited the Reebok Pro Summer League teams — the Boston Celtics , Cleveland Cavaliers , Denver Nuggets , Phoenix Suns , and Washington Wizards — to play in his upstart league , the Las Vegas Summer League . The league is now owned and run by the National Basketball Association
that year 's Democratic National Convention
2004 Democratic National Convention
Reebok Pro Summer League