The recordings of the talks are getting posted online. Here are a few that I went to that I personally think are worth your time. I will probably make a few of these posts so you can use the tag devconTalks to view them.
Here we go:
The latest on Ethereum with Vitalik Buterin.
Cryptoeconomics at Scale by Karl Floersch
Decentralize, Democratize, or Die by Cory Doctorow
You can also skip my recommendations a just go to the source on Slideslive: