sentences:  Riots took place in 2006, 2007, 2008 and 2009 related to events surrounding the Undie 500 car rally organised by students from Canterbury University.Other student social events during the year such as the Toga Parade and the Hyde Street Keg Race are also notable for attracting police attention, but not to the scale of the Undie riots.In 2012 there were 80 people treated by emergency services and 15 arrests by police after the Hyde Street party went out of control.