Some AdSense publishers are saying they have received an invitation from Google named "Learn with Google." There is a thread of a bunch of these publishers talking about it at WebmasterWorld.
Google has AdSense events all the time, but this one is different. One publisher said:
It looks similar to the Adsense in Your City events, but this is an all day thing with breakfast and a happy hour.
I did find a "Learn with Google" landing page over here but it seems more AdWords focused than AdSense focused.
If anyone has a picture of the email invite, feel free to attach it to the comments.
Forum discussion at WebmasterWorld.