How to cite a lecture in a bibliography using Chicago
The most basic entry for a lecture consists of the speaker name, presentation title, presentation type, sponsor, event, city, and date conducted.
Last Name, First Name. "Presentation title." Presentation Type, Event from Sponsor, City, Date Conducted.
Pausch, Randy. "Really Achieving Your Childhood Dreams." Lecture, Journeys from Carnegie Mellon University, Pittsburgh, PA, September 18, 2007.
Begin the citation with the name(s) of the speaker(s). The first person's name should be reversed, with a comma being placed after the last name and a period after the first name (or any middle name). Titles and affiliations associated with the speaker should be omitted. A suffix, such as a roman numeral or Jr./Sr. should appear after the author's given name, preceded by a comma.
For a lecture by two or more speakers, reverse only the first speaker's name, while the others are written in normal order. Separate speaker names by a comma.
Pausch, Randy, and Jai Pausch. "Really Achieving Your Childhood Dreams." Lecture, Journeys from Carnegie Mellon University, Pittsburgh, PA, September 18, 2007.
Include the presentation title, along with a period, in quotation marks, after the speaker names. The title should be capitalized in headline style. If there is no title, instead include a description of the presentation topic. Then state the type of presentation (e.g. Reading, Lecture, Address, Keynote Speech/Speech), followed by a comma. Next include the event name, the word "from", the institution sponsoring the presentation, and a comma. Complete the citation with the city in which the event occurred, a comma, the date of the presentation (in the format of month day, year), and a period.
If the lecture is a class lecture, the event name should be the course name, and the sponsor should be the school/university at which the lecture occurred.
Pausch, Randy. "Character Interactions." Class lecture, Building Virtual Worlds from Carnegie Mellon University, Pittsburgh, PA, February 25, 2005.