Chance the Rapper threw a free festival for teens only in his hometown of Chicago today. Chance surprised the crowd by bringing out a special and unexpected guest during his performance, Kendrick Lamar. This isn’t the first time Chance has thrown this kind of event. He has brought special guests like Kanye West and Vic Mensa to do surprise performances at other teen-only events that he has thrown in Chicago. You can watch the clip below via Fakeshoredrive’s Instagram page.