At the bottom of the Fibster Photo Index page I've put links to various FIBS parties from the past 10 years. These are all the ones I could still find, although I'm sure this is only a tiny fraction of the various Fibster gatherings...
homepage.mac.com/alefrosenbaum/fibs...ex.html#parties
-Alef
Correction (Jan 2004) -- the site is now part of the archive here:
www.fibsboard.com/archive