There is the Target Green conference on October 3 in Washington, DC.
There are two webcasts:
Marketing to the Social Web - A PRWeek/Racepoint Group Webcast
Date: Tuesday, September 25, 2007
Time: 12pm EST/9am PST
How to Win a PRWeek Award
Date: Thursday, September 20, 2007
Time:12pm EST/9am PST