Question: The assembly met in the Ananda Samakhom Throne Hall in what year?
About the article "Thailand", section "28 June 1932".

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National Assembly.
The legislative branch (also called the Parliament of Thailand) of the Thai government was first established in the ‘Temporary’ Constitution of 1932.
The assembly first met on 28 June 1932 in the Ananda Samakhom Throne Hall.
The National Assembly of Thailand is a bi-cameral legislature and comprises two houses: the Senate and the House of Representatives.
The legislative branch took its current form in 2007.
The National Assembly has 630 members.
Both houses of the National Assembly meet at the Parliament House of Thailand. 
Prior to 1932, the Kingdom of Siam did not possess a legislature, as all legislative powers were vested within the person of the monarch.
This had been the case since the foundation of the Sukhothai Kingdom in the 12th century: as the king was seen as a "Dharmaraja" or "King who rules in accordance with Dharma" (the Buddhist law of righteousness).
However on 24 June 1932 a group of civilians and military officers, calling themselves the Khana Ratsadon (or People's Party) carried out a bloodless revolution, in which the 150 years of absolute rule of the House of Chakri was ended.
In its stead the group advocated a constitutional form of monarchy with an elected legislature.
The "Draft Constitution" of 1932 signed by King Prajadhipok, created Thailand's first legislature, a People's Assembly with 70 appointed members.
The assembly met for the first time on 28 June 1932, in the Ananda Samakhom Throne Hall.
The Khana Ratsadon decided that the people were not yet ready for an elected assembly; however they later changed their minds.
By the time the "permanent" constitution came into force in December of that year, elections were scheduled for 15 November 1933.
The new constitution also changed the composition of the assembly to 78 directly elected and 78 appointed (by the Khana Ratsadon) together compromising 156 members.
The Merit-making Ceremony in dedication to the past monarchs and holding the great audience, or "Thai" พระราชพิธีบวงสรวงสมเด็จพระบูรพมหากษัตริยาธิราชและเสด็จออกมหาสมาคม (Phra ratchaphithi buangsuang somdet phra burapha maha kasattriyathirat lae sadet ok maha samakhom),at Ananta Samakhom Throne Hall, Dusit Palace. 
Ever since the June 28, 1932, the legislature met in the Ananta Samakhom Throne Hall.
After the first elections to the National Assembly in 1933, King Prajadhipok officially gave the Throne Hall for the legislature's use.
However through the years the composition of the Assemblies increased and the Throne Hall became too small to accommodate all the legislators and its secretariat.
Three attempts were made to build a new building, however each failed because the government in power was terminated before a budget could be appropriated. 
The fourth attempt, however, was a success.
King Bhumibol Adulyadej appropriated to the National Assembly royal land immediately north of the Throne Hall for the site of the new Parliament House.
The construction began on 5 November 1970, with a budget of 51,027,360 baht.
The new Parliament House complex comprises three buildings:  The First Building: or the Parliament House, has three stories and contains the meeting chambers for the National Assembly, which the Senate and the House both share.
It also contain the offices of the President and Vice President of the National Assembly and the deputy presiding officers.
The Second Building: a seven-story building contains the Secretariat and offices of the National Assembly as well as its Printing Press.
The Third Building: a two-story building used as the Parliament club with facilities for Assembly members.
The Parliament House was first used in 19 September 1974, as the Ananda Samakhom Throne Hall became a national historic building.
From then on the Parliament House became the primary building used for the National Assembly, only the State Opening is held in the Throne Hall.