Question: When did the UN Security Council have its first session?
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United Nations Security Council Resolution 6, adopted unanimously on May 17, 1946, listed dates when the Security Council would review new applicants for the UN.
The resolution was amended on July 24 because of the postponement of the opening date of the second part of the first session of the General Assembly.
The dates in the original resolution were pushed back as many days as was the interval between the anticipated convening day and the actual one. 
The Georgian Ministry of Foreign Affairs tried to secure the holding of a UN Security Council session to discuss the incident and to encourage the international involvement into the investigation of the attack.
Former Georgian president Shevardnadze dismissed efforts to involve the United Nations, as Russia would use its veto as a permanent member of the Security Council to thwart any real investigation or criticism.
On 16 August, the United States, which backed Georgia's call for a special session, attempted to have the Security Council issue a statement on the alleged incident.
Russia, however, blocked the move, calling it "premature."
The United Nations Security Council (UNSC) is one of the principal organs of the United Nations and is charged with the maintenance of international peace and security.
Its powers, outlined in the United Nations Charter, include the establishment of peacekeeping operations, the establishment of international sanctions, and the authorization of military action.
Its powers are exercised through United Nations Security Council resolutions.
The Security Council held its first session on 17 January 1946 at Church House, Westminster, London.
Since its first meeting, the Council, which exists in continuous session, has travelled widely, holding meetings in many cities, such as Paris and Addis Ababa, as well as at its current permanent home at the United Nations Headquarters in New York City.
There are 15 members of the Security Council, consisting of five veto-wielding permanent members (China, France, Russia, the United Kingdom, and the United States) and 10 elected non-permanent members with two-year terms.
This basic structure is set out in Chapter V of the UN Charter.
Security Council members must always be present at UN headquarters in New York so that the Security Council can meet at any time.
This requirement of the United Nations Charter was adopted to address a weakness of the League of Nations since that organization was often unable to respond quickly to a crisis. 
As the situation in Europe escalated into war, the Assembly transferred enough power to the Secretary General on 30 September 1938 and 14 December 1939 to allow the League to continue to exist legally and carry on reduced operations.
The headquarters of the League, the Palace of Nations, remained unoccupied for nearly six years until the Second World War ended.
At the 1943 Tehran Conference, the Allied powers agreed to create a new body to replace the League: the United Nations.
Many League bodies, such as the International Labour Organization, continued to function and eventually became affiliated with the UN.
The designers of the structures of the United Nations intended to make it more effective than the League.
The final meeting of the League of Nations took place on 12 April 1946 in Geneva.
Delegates from 34 nations attended the assembly.
This session concerned itself with liquidating the League: it transferred assets worth approximately US$22,000,000 in 1946, (including the Palace of Peace and the League's archives) to the UN, returned reserve funds to the nations that had supplied them, and settled the debts of the League.
Robert Cecil is said to have summed up the feeling of the gathering during a speech to the final assembly when he said:The motion that dissolved the League passed unanimously: "The League of Nations shall cease to exist except for the purpose of the liquidation of its affairs."
It also set the date for the end of the League as the day after the session closed.
On 19 April 1946, the President of the Assembly, Carl J. Hambro of Norway, declared "the twenty-first and last session of the General Assembly of the League of Nations closed".
The League of Nations ceased to exist the following day.
Professor David Kennedy portrays the League as a unique moment when international affairs were "institutionalized", as opposed to the pre–First World War methods of law and politics.
The principal Allies in the Second World War (the UK, the USSR, France, the US, and the Republic of China) became permanent members of the United Nations Security Council in 1946.
(In 1971 the People's Republic of China replaced the Republic of China (Taiwan) as permanent member of the UN Security Council, and in 1991 the Russian Federation replaced the USSR.)
Decisions of the Security Council are binding on all members of the UN; however, unanimous decisions are not required, unlike in the League Council.
Permanent members of the Security Council can wield a veto to protect their vital interests.
Like its predecessor, the United Nations does not have its own standing armed forces, but calls on its members to contribute to armed interventions, such as during the Korean War and for the peacekeeping mission in the former Yugoslavia. 
The 2018 United Nations Security Council election will be held in October 2018 during the 73rd session of the United Nations General Assembly, held at United Nations Headquarters in New York City.
The elections are for five non-permanent seats on the UN Security Council for two-year mandates commencing on 1 January 2019.
It marks the first time that Israel will be a candidate for the council.
From 1965 when the current electoral format was adopted, until 2000 when Israel joined the Western European and Others Group, it had been impossible for Israel to bid for a seat as several states blocked its membership in the Asian Group.
In accordance with the Security Council's rotation rules, whereby the ten non-permanent UNSC seats rotate among the various regional blocs into which UN member states traditionally divide themselves for voting and representation purposes, the five available seats are allocated as follows: One for Africa  One for the Asia-Pacific Group One for Latin America and the Caribbean Two for the Western European and Others Group  The five members will serve on the Security Council for the 2019–20 period.