High Quality Content by WIKIPEDIA articles! The 2009 Bonnaroo Music and Arts Festival was held June 11–14, 2009 at a 700-acre (2.8 km2) farm in Manchester, Tennessee, United States. There were roughly 75,000 people in attendance. The onset of Bonnaroo 2009 was punctuated by monstrous thunderstorms. Thursday night included heavy rain, lightning, strong winds and hail. A lighter storm passed over the farm on Friday. The resulting mud became a hardship for some and a plaything for others.