Comedian John Oliver, now the host of “Last Week Tonight with John Oliver,” delighted students at Edison Theatre in 2011. The Class of 2015 also has been treated to free comedy shows from “Saturday Night Live” and “30 Rock” writer Hannibal Buress (2012), “Parks and Recreation” actor Nick Offerman (2013) and “Saturday Night Live” star Kenan Thompson (2014). Photo credit: Whitney Curtis/WUSTL Photos.