I'm quite surprised that Open Source Bridge wasn't mentioned in this article. Its a volunteer-driven open source conference based in Portland, OR. It primarily spawned because of OSCON moving to San Jose last year, but they are doing it again this year even though OSCON is back.
They created their own open source software called Open Conference Ware to battle many of the proposal, registration problems. Granted, I don't think they use completely open source tools in their stack (i.e. google lists, docs, etc), but they do use etherpad and mediawiki for their site for other tasks.
I wasn't a primary volunteer with the group but I knew most of them personally. They're set to do their second annual event in the first week of June and seem to have quite the momentum going so far.I highly recommend you check them out if you're interested in running our own conference down the road!
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