This could be really handy, as putting several hundred sessions into the regular forum means that when people respond to a session forum, you have to find a way not to have that overwhelm the other forum responses.
In the http://community.cue.org network, I did that by using categories, and only allowing one "general" category to show on the front page. However, that is limiting, and a second forum would seem to be a better solution. I'm going to test by setting up here.