Oral Presentation
Chicago Manual 14.217
See examples below for:
Lecture
Notes-Bibliography Style
       1st Footnote or Endnote
           1. Gregory R. Crane, "Contextualizing Early Modern Religion in a Digital
       World" (lecture, Newberry Library, Chicago, September 16, 2011).      
       Bibliography
       Crane, Gregory R. "Contextualizing Early Modern Religion in a Digital World."  
           Lecture, Newberry Library, Chicago, September 16, 2011.
Author-Date Style
       1st Parenthetical Note
       (Crane 2011)
       Reference List
       Crane, Gregory R. 2011. "Contextualizing Early Modern Religion in a Digital  
           World." Lecture, Newberry Library, Chicago, September 16.  
Paper Presentation
Notes-Bibliography Style
       1st Footnote or Endnote
           15. Carole Pateman, "Participatory Democracy Revisited," (presidential
       address, annual meeting of the American Political Science Association,
       Seattle, September 1, 2011).
       Bibliography       
       Pateman, Carole. "Participatory Democracy Revisited." Presidential address,
           Annual Meeting of the American Political Science Association, Seattle,
           September 1, 2011.
Author-Date Style
       1st Parenthetical Note
       (Pateman 2011)
       Reference List
       Pateman, Carole. 2011. "Participatory Democracy Revisited." Presidential
           address,annual, meeting of the American Political Science Association,
           Seattle, September 1.
Poster Presentation
Notes-Bibliography Style
       1st Footnote or Endnote
           1. Hannah Rohde, Roger Levy, and Andrew Kehler, "Implicit Causality Biases
       Influence Relative Clause Attachment." (poster, 21st CUNY Conference on
       Human Sentence Processing, Chapel Hill, NC, March 2008), http://idiom.ucsd.edu
       /~rlevy/papers/cuny2008/rohde-levy-kehler-2008-cuny.pdf.
       Bibliography       
       Rohde, Hannah, Roger Levy, and Andrew Kehler. "Implicit Causality Biases
           Influence Relative Clause Attachment." Poster presented at the 21st CUNY
           Conference on Human Sentence Processing, Chapel Hill, NC, March 2008.
           http://idiom.ucsd.edu/~rlevy/papers/cuny2008/rohde-levy-kehler-2008-cuny
           .pdf.
Author-Date Style
       1st Parenthetical Note
       (Rohde, Levy, and Kehler  2008)
       Reference List
       Rohde, Hannah, Roger Levy, and Andrew Kehler. 2008. "Implicit Causality
           Biases Influence Relative Clause Attachment." Poster presented at the 21st
           CUNY Conference on Human Sentence Processing, Chapel Hill, NC, March.
           http://idiom.ucsd.edu/~rlevy/papers/cuny2008/rohde-levy-kehler-2008-cuny
           .pdf.