Reebok Pro Summer League , known originally as the Shaw 's Pro Summer League , was a professional basketball developmental league hosted by the Boston Celtics of the National Basketball Association ( NBA ) during the league 's off-season at Clark Athletic Center on the campus of the University of Massachusetts Boston . Founded in 1999 , the league planned a 2004 season , but was forced to fold due to the 2004 Democratic National Convention , which was being held in Boston . From 1999 to 2002 , the league was sponsored by grocery store chain Shaw 's . In 2003 , footwear and apparel company Reebok became the title sponsor of the league
2004 Democratic National Convention
2004 Democratic National Convention
Reebok Pro Summer League