There are still some education-related things going on that aren't necessarily associated with a RL college or university.
I'm a physics & astronomy prof at a small college in Western PA. My college isn't in SL (in fact, I wouldn't be surprised if I were the only person on campus with an SL account). However, I do give public outreach talks related to physics and astronomy in association with the Science Circle. They are on break right now for the holidays, but most Saturdays during the academic year they have somebody giving a talk.
They keep their calendar of upcoming presentations here. (Right now, they have "excursions" posted, which are less-formal visits to things that people associated with the Science Circle have built in-world.) You can find videos of recent presentations linked there (including my recent one about the two colliding neutron stars we observed with gravitational waves as well as optical light of all frequencies). Most/all of the previous talks are archived on YouTube.