Environmental defender and political heir Robert F. Kennedy Jr. will take the stage at Bonnaroo this Saturday. Kennedy will sit down for a one on one interview about current environmental issues with Rock the Earth Founder and President Marc Ross from 4:45-5:15 PM on Bonnaroos Solar Stage. In addition, Kennedy will introduce Grand Canyon Adventure, a movie about the wonders and threats facing the stretch of the Colorado River that flows through Grand Canyon National Park. With a soundtrack composed by Dave Matthews Bands Stefan Lessard and featuring several sections from the DMB catalogue, the film should gel with the Bonnaroo faithful. Please click here for a site interview with Lessard about the project.