Londvasion
I myself am on the PHP project, and having been involved with phpBB since before I can remember (thats a lie), I jumped at the chance to go to LondonVasion, the first ever phpBB conference, phpBB being open source forum software.
And I have just been accepted as a contributor for LondonVasion’s website.
Details on Londonvasion: http://www.londonvasion.info/2008/07/10/less-than-10-days-left/ or http://phpbb.com/
Its this Sunday if your going hit me back :-)
BarryCarlyon