Question: Which city in central Niger was where weapons were burned in September 2000 to commemorate a peace agreement?

Context paragraphs:
Plan Colombia: Plan Colombia was the name of a United States foreign aid, military and diplomatic initiative aimed at combating Colombian drug cartels and left-wing insurgent groups in Colombia.  The plan was originally conceived in 1999 by the administrations of Colombian President Andrés Pastrana and US President Bill Clinton, and signed into law by the U.S in 2000.  The official objectives of Plan Colombia were to end the Colombian armed conflict by increasing funding and training of Colombian military and para-military forces and creating an anti-cocaine strategy to eradicate coca cultivation, though critics claim this largely served as a cover to increase U.S. military presence and protect U.S. corporate interests in the region.  Plan Colombia in its initial form existed until 2015, with the United States and the Colombian government seeking a new strategy as a result of the peace talks between the Colombian government and the FARC.  The new program is called "Peace Colombia" and seeks to provide Colombia with aid after the implementation of the Peace Agreement in 2017 with the FARC.  However, there remain several U.S. military bases and close to 1000 U.S. Marines in Colombia who have yet to withdraw from the country in accordance with the new peace agreement, and show little indication of doing so.

Movement for the Survival of the Ogoni People: The Movement for the Survival of the Ogoni People, also known as (MOSOP), is a mass‐based social movement organization of the indigenous Ogoni people of Central Niger Delta.  MOSOP is the umbrella organization of currently 11 member groups representing more than 700,000 indigenous Ogoni in campaigning for social, economic and environmental justice in the Niger Delta of Nigeria.  MOSOP's mandated use of non-violent methods to promote democratic principles assist Ogoni people pursue rights of self-determination in environmental issues in the Niger Delta, cultural rights and practices for Ogoni people.

Tuareg rebellion (2007–2009): The Tuareg Rebellion of 2007–2009 was an insurgency that began in February 2007 amongst elements of the Tuareg people living in the Sahara desert regions of northern Mali and Niger.  It is one of a series of insurgencies by formerly nomadic Tuareg populations, which had last appeared in the mid-1990s, and date back at least to 1916.  Populations dispersed to Algeria and Libya, as well as to the south of Niger and Mali in the 1990s returned only in the late 1990s.  Former fighters were to be integrated into national militaries, but the process has been slow and caused increased resentment.  Malian Tuaregs had conducted some raids in 2005–2006, which ended in a renewed peace agreement.  Fighting in both nations was carried on largely in parallel, but not in concert.  While fighting was mostly confined to guerrilla attacks and army counterattacks, large portions of the desert north of each nation were no-go zones for the military and civilians fled to regional capitals like Kidal Mali and Agadez Niger.  Fighting was largely contained within Mali's Kidal Region and Niger's Agadez Region.  Algeria helped negotiate an August 2008 Malian peace deal, which was broken by a rebel faction in December, crushed by the Malian military and wholescale defections of rebels to the government.  Niger saw heavy fighting and disruption of Uranium production in the mountainous north, before a Libyan backed peace deal, aided by a factional split among the rebels, brought a negotiated ceasefire and amnesty in May 2009.

Liberation and Justice Movement: The Liberation and Justice Movement is a rebel group in the Darfur conflict in Sudan, led by Dr Tijani Sese.  The Liberation and Justice Movement is an alliance of ten smaller Darfuri rebel organisations which formed a new grouping on 23 February 2010.  On 20 March 2010, the Liberation and Justice Movement signed a cease-fire agreement with the Sudanese Government and agreed to talks that could lead to a final peace agreement.  The Liberation and Justice Movement participated in the Doha peace negotiations held in December 2010 and in January 2011, its leader stated that the movement had accepted the core proposals of the Darfur peace document proposed by the joint-mediators.  On 29 January 2011, the leaders of the Liberation and Justice Movement and of the rival Justice and Equality Movement issued a joint statement stating their commitment to the Doha negotiations and agreed to attend the Doha forum in February 2011.  The Liberation and Justice Movement signed a new Darfur Peace Agreement with the Sudanese Government in July 2011; however, various factions of the group have merged with the Justice and Equality Movement.

Concord Day: Concord Day marks the anniversary of the signing of the 24 April 1995 Peace Accord between the Government of Niger and the Organisation of Armed Resistance ("Organization de Resistance Armee", ORA) at the Congressional Palace in Niamey ("Palais des Congrès de à Niamey").  While this accord was signed only by some armed groups and sporadic fighting continued until 1999, it marked the beginning of the end of the 1990 rebellion in the north and east of the country carried out by elements of Tuareg, Toubou, and other communities.  The final peace agreement was celebrated with a "Flame of Peace" in which weapons were burned in Agadez on 25 September 2000, a date that is also commemorated each year in some communities.

Agadez: Agadez, formerly spelled Agades, is the largest city in central Niger, with a population of 118,244 (2012 census).  It lies in the Sahara and is the capital of Aïr, one of the traditional Tuareg–Berber federations.  The city is also the capital of the Agadez Region.  As of 2011, the urban commune had a total population of 124,324 people.

Goulbi de Maradi River: The Goulbi de Maradi is a river in south central Niger and north central Nigeria.  Between its source near Katsina in Nigeria, and its end in the Rima River, the Goulbi de Maradi never flows more than 30 mi from the Niger–Nigeria border.  Though important for agriculture and pastoralism, and flowing through the Niger cities of Maradi, Guidan Roumdji, and Madarounfa, the Goulbi de Maradi is a seasonal river and flows only during the rainy season.

Michel Djotodia: Michel Am-Nondokro Djotodia (born c. 1949) is a Central African politician who was President of the Central African Republic from 2013 to 2014.  He was the first Muslim to hold that office in the predominantly Christian country.  Djotodia was a leader of the almost entirely Muslim Séléka rebel coalition in the December 2012 rebellion against President François Bozizé.  Following a peace agreement, Djotodia was appointed to the government as First Deputy Prime Minister for National Defense in February 2013.  When the peace agreement unravelled, Séléka captured Bangui and Djotodia took power on 24 March 2013.  He promised to lead a transition to new elections in which he would not be a candidate, but his time in office was marked by escalating sectarian violence, and he was ultimately pressured into resigning by regional leaders on 10 January 2014.

Accra Comprehensive Peace Agreement: The Accra Comprehensive Peace Agreement or Accra Peace Agreement was the final peace agreement in the Second Liberian Civil War.  It was signed on the August 18, 2003, in Accra, Ghana.  It was created following the signing of a ceasefire agreement on June 17, 2003, and "intensive back-door negotiations" beginning on June 4 in Akosombo, Ghana.

Gadal language: The Gadal language (Tuareg name: "Tagdal") is a mixed Northern Songhay language of central Niger.  "Ethnologue" considers it a "mixed Berber–Songhay language", while other researchers consider it Northern Songhay.  About half of its daily vocabulary is Tuareg, and three quarters overall.  There are two dialects: Tagdal proper, spoken by the Igdalen people, pastoralists who inhabit a region to the east along the Niger border to Tahoua in Niger, and Tabarog, spoken by the Iberogan people of the Azawagh valley on the Niger–Mali border.

Supporting paragraphs: Concord Day Agadez
Answer: Agadez