Question: Which year did Alvin Cheng organize the rally with his schoolmates in support of the hong kong umbrella movement?

full_context: Document 1: 2014 Hong Kong protests: A series of sit-in street protests, often called the Umbrella Revolution () and sometimes used interchangeably with Umbrella Movement (), occurred in Hong Kong from 26 September to 15 December 2014. The protests began after the Standing Committee of the National People's Congress (NPCSC) issued a decision regarding proposed reforms to the Hong Kong electoral system. The decision was widely seen to be highly restrictive, and tantamount to the Chinese Communist Party's pre-screening of the candidates for the leader of Hong Kong.
Document 2: 2014 NPCSC Decision on Hong Kong: The Decision of the Standing Committee of the National People's Congress on Issues Relating to the Selection of the Chief Executive of the Hong Kong Special Administrative Region by Universal Suffrage and on the Method for Forming the Legislative Council of the Hong Kong Special Administrative Region in the Year 2016 (), commonly known as 31 August Decision (), is a decision made by the Standing Committee of the National People's Congress (NPCSC), the national legislative body of the People's Republic of China (PRC) on 31 August 2014 which set limits for the 2017 Chief Executive election and 2016 Legislative Council election in the Hong Kong Special Administrative Region (HKSAR).
Document 3: Ashanti Alston: Ashanti Alston Omowali is an anarchist activist, speaker, and writer, and former member of the Black Panther Party. Even though the party no longer exists, Alston sometimes refers to himself as a Black Panther, and sometimes as "the @narchist Panther", a term he coined in his "@narchist Panther Zine" series. He was also member of the Black Liberation Army, and spent more than a decade in prison after police captured him and he was convicted of armed robbery. Alston disputes the moral issues of property and terms his activity in the BLA "bank expropriation". Alston is the former northeast coordinator for Critical Resistance, a current co-chair of the National Jericho Movement (to free U.S. political prisoners), a member of pro-Zapatista people-of-color U.S.-based Estación Libre, and is on the board of the Institute for Anarchist Studies. Since 1999, Alston has produced four issues of the zine, "@narchist Panther Zine" (the name being a reference to his current affiliation as an anarchist, and his past membership in the Black Panther Party). Alston has identified himself as a black anarchist as well as a postmodern anarchist.
Document 4: Occupy Central with Love and Peace: Occupy Central () was a civil disobedience campaign initiated by Benny Tai Yiu-ting, Associate Professor of Law at the University of Hong Kong, and advocated by Occupy Central with Love and Peace (organisation; OCLP; 讓愛與和平佔領中環 or 和平佔中). In the course of the 2014 Hong Kong electoral reform, OCLP intends to pressure the PRC Government into granting an electoral system which "satisf[ies] the international standards in relation to universal suffrage" in Hong Kong Chief Executive election in 2017 as promised according to the Hong Kong Basic Law Article 45. Should such an electoral system not be achieved, OCLP sought to fight for equal suffrage in Hong Kong through civil disobedience means, namely the non-violent occupation of Central.
Document 5: Umbrella Square: Umbrella Square (), also called Umbrella Plaza, describes a large roadway in Admiralty, Hong Kong occupied by protesters during the Umbrella Movement protests in September 2014. On 11 December 2014, after 74 days of occupation, the area was cleared by the police and reopened to motorised traffic.
Document 6: Apex (gang): Apex is a street gang in Melbourne, Australia. It was formed in 2012. The founding members were part of Victoria's South Sudanese community, although the gang later became more diverse, particularly after it merged with the YCW gang. Associated with violent car-jackings and burglaries, Apex came to prominence in the national media after a brawl in Melbourne's Central Business District between it and the rival Islander 23 gang in March 2016 after the Moomba parade. This prompted a crackdown by Victoria Police. They apparently have little structure and no official colours.
Document 7: Lennon Wall (Hong Kong): Lennon Wall refers to the artistic form of expressions in the protest. Lennon Wall Hong Kong literally refers to the democratic mosaic wall created during the Umbrella Movement, located at Central Government Complex, Harcourt Road, Admiralty, which is one of the main landmarks in the occupation area of Admiralty and one of the major arts of the Umbrella Movement as collective artistic works demanding democracy in the election of the territory’s top leader.
Document 8: Art of the Umbrella Movement: Art of the Umbrella movement refers to artistic works created as part of the Umbrella movement in Hong Kong which demanded democracy in the election of the territory's top leader. Most of the physical works of art are located within the three main protest sites of Admiralty, Causeway Bay and Mong Kok, some concepts have originated from outside Hong Kong.
Document 9: Hoang Tu Duy: Hoàng Tứ Duy (chữ Hán: 黃四維 ; also known as Duy "Dan" Hoang) is a Vietnamese-born American democracy activist. He is currently the spokesperson for Viet Tan, an unsanctioned political movement in Vietnam. Before becoming a full-time democracy activist, he worked as an investment banker for over 10 years. He has testified before US Congressional committees on human rights issues and written for the Wall Street Journal, Asia Times Online and leading Vietnamese-language publications.
Document 10: Umbrella Ultra Marathon: The Umbrella Ultra Marathon, or Umbrellaultra, was a 102 km distance running event held on 29 October 2014. It was not a competitive race, but a running event to support the Umbrella Movement of Hong Kong. The course covered New Territories, Kowloon and Hong Kong Island, which shows an umbrella shape on the map. Thus the trail is also known as the Umbrella Trail.
Document 11: Alvin Cheng: Alvin Cheng Kam-mun (, born 23 June 1988), also known as "4 Eyes Brother" (), is a Hong Kong student activist, active since 2014. He was a former student at Queensland University of Technology in Australia, and organised a rally with his schoolmates and Nardo Wai in support of the Hong Kong Umbrella Movement during the 2014 G20 Brisbane summit. His political opinions include the use of violence to fight against the police force. He is well known for participating in the Hong Kong Umbrella Movement, and establishing the student activism organization Student Front.
Document 12: Unofficial Member: Unofficial Member () is the name given to individuals who are members of the Executive Council of Hong Kong and Legislative Council of Hong Kong but who are not members of the Hong Kong Government. Before the direct election of Legislative Council members in 1991, the Government reflected the views and opinions of Hong Kong society by appointing members of the business and social elites to the two councils. These members acted as a bridge between local residents and the Government. From 1960s to 1980, the "unofficial members of both councils, together formed the UMELCO Office which handled the complaints of Hong Kong residents.
Document 13: Hong Kong 1 July marches: The Hong Kong 1 July protests () is an annual protest rally originally held by the Civil Human Rights Front from the day of handover in 1997 on the HKSAR establishment day. However, it was not until 2003 that the march drew large public attention by opposing the legislation of Basic Law Article 23. The 2003 protest, with 500,000 marchers, was the largest protest seen in Hong Kong since the 1997 handover. Prior to this, only the pro-democracy protest on 21 May 1989 drew more people with 1.5 million marchers in Hong Kong sympathising with the participants of the Tiananmen Square protests of 1989. The introduction of Article 23 legislation leave aside due to the protest. Since then, 1 July marches have been organized every year to demand for democracy, universal suffrage, rights of minorities, protection of freedom of speech, and a variety of other political concerns.
Document 14: Euan Edworthy: Euan Edworthy was educated at Ampleforth College, UK, and graduated from the University of Wales, Cardiff, in 1991 with a degree in Politics and History. In 2004, he initiated continental Europe’s first ever Speakers' Corner in Prague and in 2007 established Speakers’ Corner Trust, an international charity, with former British MP Peter Bradley which promotes freedom of speech. Euan is also a Trustee of the Anglo Czech Education Fund and conceived the idea for the Winged Lion Memorial to commemorate Czechoslovaks who fought with the Royal Air Force during the Second World War. The monument was unveiled in Prague on 17 June 2014 to much local and global acclaim. He has also established the Czech Children of Courage Award and Prague’s Red Nose Day Campaign.
Document 15: Umbrella Movement: The Umbrella Movement () is a political movement that emerged during the Hong Kong democracy protests of 2014. Its name arose from the use of umbrellas as a tool for passive resistance to the Hong Kong Police during the occupation which was sparked by the decision of the Standing Committee of the National People's Congress (NPCSC) of 31 August of that year which prescribed a selective pre-screening of candidates for election of the region's leader.
ground_truth: 2014