Since most of the world is recovering from SXSW, it looks like there is no refresh this month.
So, if you are a developer (or other interested party), I highly recommend this month's DC OWASP meeting -- albeit it's in Columbia, so a bit of a haul for a lot of people.
Jeff Williams, one of the founders of OWASP and the head of Aspect Security will be talking about the OWASP Enterprise Security API.