Jun 25, 2015 Today, Chance the Rapper threw a free festival for teenagers in his hometown of Chicago. During his performance at Teens in the Park, Chance was joined by a very special guest: Kendrick Lamar. Watch footage below. This isn't the first time Chance has brought a huge name guest to a free teen-only event in Chicago. At a recent open mic night for teens, Kanye West and Vic Mensa came through with a surprise performance. Also, at Bonnaroo, Chance and Kendrick both made surprise appearances during Earth, Wind & Fire's set. Chance headlines next month's Pitchfork Music Festival at Chicago's Union Park, where he'll be joined by Wilco, Sleater-Kinney, and others. Single-day passes are still available. http://pitchfork.com/news/60110-cha...ick-lamar-at-free-chicago-festival-for-teens/