Harvard Astronomy students can present their thesis research to a live audience of non-scientists, going above and beyond the required CfA Public Talk that precedes the student's thesis defense. To meet the dissertation outreach requirement, this talk would need to be recorded and made publicly accessible online. Some possible venues for such a presentation are listed below.
CfA Monthly Public Observing Nights
The CfA holds monthly public lectures and telescope viewings attended by hundreds of Boston area children and adults. Harvard Astronomy students are eligible to deliver these public talks, and interested students should contact Christine Pulliam.
Science in the News
Harvard GSAS student organization Science in the News provides graduate students with the opportunity to describe their field to ~200 Boston area children and adults in their weekly seminar series. SITN officers will coordinate the event and provide frequent feedback and rehearsal to prepare for the presentation.
For a past example, see Anjali Tripathi's 2012 SITN talk.
Harvard Students can apply to give talks in the local series of TED talks organized by TEDx Beacon Street. An example of a recent talk is included below.