FOSDEM
I initiated the Free and Open Source Software Developer's European Meeting in 2001 and unti 2007 lead its organisation and growth to become the major developers meeting in Europe it is today with more than 4000 visitors.
The goal of FOSDEM was to enable developers to meet in real life, and foster collaboration, also across projects. It is a big satisfaction to know these goals have been reached.
Today FOSDEM is lead by a group of volunteers who consistently deliver a great job by perpetuating this yearly conference.