We became Civil Partners, with a ceremony in Addington Palace, Croydon on the 21st of December 2005: the first day that the law in England allowed us to do this. The ceremony was followed by lunch for family and friends, ending with a performance by the City of Brighton Gay Men's Chorus. See here for some more photographs.
Three years before, on the 14th of September 2002, we were registered under the GLA partnership Register at City Hall, London, followed by "Lunch on the Water" on the HQS Wellington, moored on the River Thames. See here for more about this.