This question modified repost of my comment on Quora, inspired by a helpful answer of Greg Bernhardt there.
I am thinking about trying to obtain an oportunity to give a talk to intrudoce PhysicsOverflow at my university, to get the local professors and grad students interested in the site. But I am not quite sure what context would be appropriate to do so.
For example there is the weekly seminar for PhD students, or the official physics kolloquium where established physicists or invited external speakers talk about a broad range of physics topics at a level comprehensible for colleagues working in nearby research fields. A talk about an online physics community would not be exactly on-topic in both contexts.
So what are some more viable ideas about how PhysicsOverflow could be introduced at my local university?