You can see the list of most (not all) of them at IBM Conferences & events.
Here are the ones of most interest to this blog:
|IBM Rational Software Development Conference||June 4-8||Orlando, Florida|
|Transaction & Messaging||June 12-16||Atlanta, GA|
|Transaction and Messaging Technical Conference||October 2-6||Vienna, Austria|
|WebSphere Technical Conference|
|WebSphere Technical Exchange||Oct 30-Nov 3||San Francisco, CA|