This is the 19th ACM Symposium on Access Control Models and Technologies. I am a practioner, rather than a researcher, in this area. Which means that while I have nothing to contribute, I am very interested in the results of this symposium.
Some details on what SACMAT is all about are available, appropriately enough, at the About page.
However, why I think SACMAT will inform my thinking is probably better seen in their call for papers. There are 24 in-scope topics, ranging through administration, cryptographic approaches, economic models and game theory, policy engineering and analysis, and trust management.
Where and when? London, Ontario, Canada. June 25-27, 2014.