It may be financially and geographically improbable for some people to attend Security Conferences that we'd like to attend to. Yes, it would be neat if we can all attend, but due to economic and work related factors, we may not have the opportunity to do so.
It's a good thing that the good folks at easynews have compiled this for the rest of us to view. The site hosts recent events of blackhat, defcon and other security conferences. The top domain also has mirrors of notable sites :)
Check the link out.