Wikipedia
SkeptiCamps are small- to medium-scale, self-organizing grassroots skeptical conferences in which the audience members are also the presenters. The emphasis is on Scientific Skepticism, and everyone from casual skeptics to the experienced participate. The purpose is to share ways of spreading critical thinking to others.
SkeptiCamp uses an event model that builds on a set of practices adapted from the BarCamp conference model. Like BarCamp, everyone participates, whether by giving a presentation, interacting with the speakers, helping to organize or run the event, or taking what they've learned and sharing it with the world. One difference from BarCamp is that presenters should be prepared to cite their sources on any claim that is likely to be challenged. The intent of this rule is to allow others to evaluate the substance of each talk for themselves.