Copenhagen Climate Challenge
During the United Nations Climate Change Conference 2009 (COP15), there was a rival conference in Copenhagen, Denmark, for deniers, called the Copenhagen Climate Challenge, which was organised by the Committee for a Constructive Tomorrow. While COP15 attracted 33,200 delegates, the rival deniers' conference was attended by 60 people (15 journalists, 18 speakers, 27 audience).
Source: Wikipedia — Copenhagen Climate Challenge (CC BY-SA 4.0)