Question: The Butcher of Amritsar refers to the crime that took place on what date?

Context paragraphs:
Crime scene: A crime scene is any location that may be associated with a committed crime.  Crime scenes contain physical evidence that is pertinent to a criminal investigation.This evidence is collected by crime scene investigators (CSIs) and Law enforcement. The location of a crime scene can be the place where the crime took place, or can be any area that contains evidence from the crime itself.  Scenes are not only limited to a location, but can be any person, place, or object associated with the criminal behaviors that occurred.

The Butcher of Amritsar: The Butcher of Amritsar: General Reginald Dyer is a 2006 historical biography written by Nigel Collett, a former Gurkha officer, which covers the life of Reginald Dyer.  The book's title refers to the 1919 massacre at Jallianwala Bagh in which 379 people were shot by troops under the command of Dyer.  It is the second biography written on Dyer, the first having been written in the 1930s with co-operation from Dyer's widow which was described by Saul David as an "unashamed hagiography".

Operation Black Thunder: Operation Black Thunder is the name given to two operations that took place in India in the late 1980s to flush out remaining Sikh activists from the Golden Temple using 'Black Cat' commandos of the National Security Guards Like Operation Blue Star, these attacks were on Kharku sikhs who were based in the Golden Temple in Amritsar, Punjab.

Jallianwala Bagh massacre: The Jallianwala Bagh massacre, also known as the Amritsar massacre, took place on 13 April, 1919 when a crowd of non-violent protesters, along with Baishakhi pilgrims, who had gathered in Jallianwala Bagh, Amritsar, Punjab, were fired upon by troops of the British Indian Army under the command of Colonel Reginald Dyer.  The civilians, in the majority Sikhs, had assembled to participate in the annual Baisakhi celebrations, a religious and cultural festival for Punjabi people and also to condemn the arrest and deportation of two national leaders, Satya Pal and Dr Saifuddin Kitchlew.  Coming from outside the city, they may have been unaware of the imposition of martial law.

Battle of Amritsar (1634): The Battle of Amritsar was a campaign by Mukhlis Khan against Guru Hargobind and the Sikhs in 1634.  The battle took place over two days and was a result of increasing tensions between the Mughal government and Guru Hargobind.

Sarbat Khalsa: Sarbat Khalsa from sarbat, a Punjabi word meaning all or everything, was a biannual deliberative assembly (on the same lines as a Parliament in a Direct Democracy) of the entire Khalsa held at Amritsar in Panjab during the 18th century.  It literally translates to the "entire Sikh Nation" but as a political institution it refers to the meetings of the Dal Khalsa, Sikh Misls, and the legislature of the Sikh Empire. The first Sarbat Khalsa was called by the tenth guru, Guru Gobind Singh before his death in 1708 and the tradition of calling Sarbat Khalsa has continued ever since at times of hardship or conflict.  After the demolition of the Mahant System by the Khalsa Panth, S. Kartar Singh Jhabbar called the Sarbat Khalsa in 1920.  He was not the Jathedar of Sri Akaal Takhat Sahib but a Sikh leader.  In the resolution of that Sarbat Khalsa, Teja Singh Bhuchhar was announced as the Jathedar of Sri Akaal Takhat Sahib.  Next known meeting of the Sarbat Khalsa took place on the occasion of Divali in 1723 when a clash between Tat Khalsa and the Bandais (owing fealty to Banda Singh Bahadur) was averted and amicably settled through the intervention and wise counsel of Bhai Mani Singh.

Indian Airlines Flight 427: Indian Airlines Flight IC427 was involved in an aircraft hijacking that took place in India between April 24 and April 25, 1993.  Commandos from the National Security Guard (NSG) rescued all 141 hostages of the Indian Airlines Boeing 737, on the ground at Amritsar airport.  The lone hijacker, Mohammed Yousuf Shah, was killed within 5 minutes of commandos entering the plane, before he could react and harm any of the hostages.  The rescue was code-named Operation Ashwamedh.

1934 Men's British Open Squash Championship: Then 1934 Open Championship featured the defending open champion and amateur champion F. D. Amr Bey of Egypt being challenged by Don Butcher the professional champion.  The first leg was held at Butcher's Conservative Club on 12 November, but it was Bey once again who prevailed winning three games to one.  The second leg took place on 19 November at the Bath Club, Bey at his home club was given his sternest test yet finally winning three games to two.

Harse Chhina Mogha Morcha: The Harsha Chhina Mogha Morcha was an agrarian revolt in Harsha Chhina, Punjab, India, that took place in 1946 under the leadership of the Communist Party.  Harsha Chhina is a village near RajaSansi Airport, Amritsar. The Morcha started in response to a decision taken by the British Government to decrease the supply of irrigation water to farmers by remodelling the "moghas" (canal outlets).  The Morcha was headed by Comrade Achhar Singh Chhina, Sohan Singh Josh, Mohan Singh Baath, Baba Karam Singh Cheema, Jagbir Singh Chhina, and Gurdial Singh Tapiala.  During this movement 950 freedom fighters were arrested by police and detained in Lahore jail for three months.

Nanak Nam Jahaz Hai: Nanak Naam Jahaz Hai (Punjabi: ਨਾਨਕ ਨਾਮ ਜਹਾਜ਼ ਹੈ ), is a 1969 National Award winning Punjabi film directed by Ram Maheshwary, starring Prithviraj Kapoor, I. S. Johar, Nishi and Vimi in lead roles.  The devotional film is based on a true incident which took place at Golden Temple, Amritsar.  The film was awarded the 1970 National Film Award for Best Feature Film in Punjabi, and National Film Award for Best Music Direction, plus it was the first major hit Punjabi film of post-independent India.

Supporting paragraphs: The Butcher of Amritsar Jallianwala Bagh massacre
Answer: 13 April, 1919