I think the CPDC forums are worth the $35.
I have gone to the last three forums. The quality of the forums varies only because of the invited speakers. I felt the forum on retail was so far the most interesting because the speakers had a lot of ideas and directly addressed the issues presented the video and the powerpoint by Paul Levy that precede the speakers. You can go here and view the powerpoints and the videos from the previous forums to get an idea of whether attending is worth it for you:
http://www.centercityphila.org/about...niversary.aspx
The videos and the powerpoint are routinely high quality. And the question and answer sessions are open to everyone. After the formal presentation you get to mingle and ask questions of the speakers. There are drinks (wine and beer) and heavy appertizers that are very good. There is enough food there to make a very hearty yummy dinner.