I disagree: I'd go there to give them an education, not receive one.
IMHO, that's the wrong attitude for any business relationship. Relationships in business should always benefit both sides, and if you approach a business associate with the attitude that you have all the answers (and they know nothing), well neither side benefits.
FWIW, I'm a long-time AdSense publisher. I was at the Learn with Google event yesterday, and some of the topics on the agenda seemed to include pretty basic stuff. But, I still picked up couple of tips in the general sessions that were valuable to me.
In the one-on-one sessions, the Googler who worked with me had some useful usability suggestions. Suggestions, that should make for a better user experience on some of our pages and hopefully also increase Adsense revenue. She had some other suggestions (placements and ad sizes) that I hadn't really considered before. They're not drastic, won't interfere with vistors seeing what they came for, so we'll test them.
There was even a session where a group of publishers was asked to give feedback about their experience with Adsense and DFP.