If you’re interested in learning more about Second Life or how to use if for educational purposes, I suggest you take a look at this calendar: http://sledevents.blogspot.com/
Many events are listed here and even have slurls (secondlife link locations) that allow you to teleport directly to the site in SL. Remember, you have to have the SL application installed, and you can get that from the Second Life official website.
I was able to attend most of the Sloodle 101 class (that occurs every Wednesday 2x a day). I highly recommend it. Hopefully, I’ll have time in the next few days to blog about my experience in the class.