It seems to only apply to the actual name of a conference:
“Our service mark applies only to
Web 2.0” when used in the *title* of “live events” such as conferences and tradeshows.”
http://radar.oreilly.com/archives/2006/05/more_on_our_web_20_service_mar.html

It would be similar to someone else having a podcast called Ed Tech Talk, n’est-ce pas?