IU President Michael A. McRobbie (right) has a conversation with IU alumnus Maher Maloney and his wife Carol Maloney during a reception President McRobbie and IU Bloomington Provost Lauren Robel hosted to celebrate the IU Auditorium's 75th anniversary.IU President Michael A. McRobbie greets a guest at the IU Auditorium 75th Anniversary Gala.IU President Michael A. McRobbie and IU First Lady Laurie Burns McRobbie (center) wait to make their entrance at the IU Auditorium 75th Anniversary Gala.IU President Michael A. McRobbie (right) has a conversation with Roberta Sherman (left) and her husband Jim Sherman (center) before dinner begins at the IU Auditorium 75th Anniversary Gala.IU First Lady Laurie Burns McRobbie mingles with guests during the IU Auditorium 75th Anniversary Gala.Doug Booher, director of the IU Auditorium and University Events, welcomes guests to the auditorium. The event celebrated the role IU Auditorium has played for both Indiana University and the surrounding community over the past 75 years. IU President Michael A. McRobbie spoke of IU's longstanding tradition of excellence and the auditorium's role in that tradition during his toast before dinner.IU President Michael A. McRobbie has a conversation with Bloomington Mayor John Hamilton during dinner.Part of the night’s festivities included music by surprise guest Chris Botti, an IU Jacobs School of Music alumnus. Botti was joined on stage by Lee Pearson on drums, Richie Goods on bass, Ben Butler on guitar, Taylor Eigsti on piano, Ben Stivers on keyboards and Sandy Cameron on violin, with vocals by Vivian Sessoms. Sandy Cameron gives a dramatic finish after performing a violin solo.Chris Botti, a jazz trumpeter and an IU Jacobs School of Music alumnus, performs during the IU Auditorium's anniversary celebration. Since the release of his critically acclaimed album "When I Fall In Love" in 2004, Botti has become one of the largest-selling American instrumental artists. His latest release, "Impressions," won the Grammy Award for Best Pop Instrumental Album in 2013.Vivian Sessoms performs at the IU Auditorium 75th Anniversary Gala. The IU Auditorium was the vision of Herman B Wells and the first building completely planned and constructed during his tenure as IU president. A Federal Works Agency project, it was built from locally quarried Indiana limestone using a combination of state and federal funding.