There was not a Trizonia conference. The Trizoniawas the name of a post WWII area of Germany, which was eventually occupied by the UK, the US, and France. During the Potsdam or Berlin Conference, the Bizonia (an area of Germany, occupied by the US and the UK, military) was zoned, and then rezoned to include France's military, hence the name "Trizonia".

The occupation was primarily in what later became West Germany, and lasted from 1945 (after Nazi Germany was defeated by the Allied powers.) through 1949.

There were three important conferences, which took place between the leaders of the US, the UK, and the Soviet Union, (the "Big Three") (Churchill, Roosevelt, and Stalin.) between 1943 and 1945.

The Tehran conference took place during WWII, in 1943. After Nazi Germany was defeated, the Yalta conference took place, in February of 1945. The last of the three conferences was the Potsdam Conference or the Berlin Conference, which took place approximately 5 months after the Yalta Conference. During the Potsdam conference, the Trizonia area, was created as a result of post war zoning.

The purpose of the Yalta and Potsdam Conferences, was to decide where post war zoning, mainly in Germany, Poland and Eastern Europe, would be drawn and set.
it is the Bi zone, or Bizonia, was the combination of the American and the British occupation zones during the occupation of Germany after World War II.

the novikov and long telegrams in 1946which led to the Truman doctrine being issued

the set up of trizonia in Germany (1947) which led to the belin blockade 1948, resulting in the US response of the Berlin airlift (1948)

the Hungarian uprising in 1956

USSR issuing the USA with the ultimatum in 1958, leading to the four summit meetings; Geneva, campdavid, Paris and Vienna (1959- 1961)

the Berlin wall in 1961

Cuban missile crisis 1962

brezhnev doctrine 1968

ussr invade Czechoslovakia 1968

ussr invade Afghanistan 1979

carter doctrine issued 1979

evil empire speech 1983