World Peace Conference
The World Peace Conference was a series of conferences held in England in the 1970s. UNIT was in charge of security for both of them.
The first World Peace Conference was held in London, and its delegates included American Senator Alcott and Chinese General Cheng Teik. The Master used the Keller Machine and a hypnotised Chin Lee to disrupt the Conference. He later planned to destroy it with the Thunderbolt missile he hijacked. The Master's scheme was defeated by the Third Doctor and UNIT. (DW: The Mind of Evil)
The conference broke down, leading to an escalating conflict between China and the Soviet Union (MA: Who Killed Kennedy) that had the world on the brink of World War III just a year later. The second World Peace Conference was arranged by Sir Reginald Styles and was to be held at Auderly House. The Conference was almost destroyed by time-travelling guerillas from an alternate 22nd century in which the Conference was destroyed by what they believed was a treacherous Styles, but was really themselves. (DW: Day of the Daleks)