The Rock Springs massacre, also known as the Rock Springs Riot, occurred on September 2, 1885, in the present-day United States city of Rock Springs in Sweetwater County, Wyoming.
 The riot, between Chinese immigrant miners and white immigrant miners, was the result of racial tensions and an ongoing labor dispute over the Union Pacific Coal Department's policy of paying Chinese miners lower wages than white miners.
 This policy caused the Chinese to be hired over the white miners, which further angered the white miners and contributed to the riot.
 When the rioting ended, at least 28 Chinese miners were dead and 15 were injured.
 Rioters burned 78 Chinese homes resulting in approximately US$150,000 in property damage ($ in present-day terms ).
The Federal Riot Gun, or FRG, was a US-manufactured firearm by Federal Laboratories Inc., designed to fire non-lethal munitions.
 Its ammunition include 37 and 38mm baton and tear gas rounds.
 The baton rounds were cylindrical, rubber projectiles.
 Fired at a relatively low velocity, the baton rounds were intended to knock rioters down, or momentarily stun them, but not to cause serious injury or death.
 Safe operating procedures in the British Army eventually ruled out firing them levelly at rioters, as it was found that the rounds could cause serious and permanent injuries.
 In 1993, a constable of the Bermuda Police Service, acting the role of enemy for a rifle company of the Bermuda Regiment, being exercised at Camp Lejeune USMC Base, was seriously injured by a baton round fired from a soldier's FRG, shattering his jaw, which required extensive surgery to reconstruct.
 Subsequently, orders were given that the weapons were to be fired into the ground ahead of rioters.
 The baton rounds would deflect upwards into the rioters, but would lose kinetic energy in the process.
The Honolulu Courthouse riot, or the Election riot, occurred in February 1874 when Hawaiian followers of Queen Emma, known as Emmaites, attacked supporters of King Kalakaua on the latter's election day and started a riot.
 Marines and sailors from three American and British warships were landed and they successfully quelled the rioters and Kalakaua took the oath of office the following day without further opposition.
The Tulsa race riot, or Tulsa race riot of 1921, occurred between May 31 and June 1, 1921, when a white mob started attacking residents and businesses of the African-American community of Greenwood in Tulsa, Oklahoma, in what is considered one of the worst incidents of racial violence in the history of the United States.
 The attack, carried out on the ground and by air, destroyed more than 35 blocks of the district, at the time the wealthiest black community in the nation.
 More than 800 people were admitted to hospitals and more than 6,000 black residents were arrested and detained, many for several days.
 The Oklahoma Bureau of Vital Statistics officially recorded 39 dead, but the American Red Cross estimated 300, a number supported by historians since then.
The Takebashi incident was an armed rebellion that occurred on August 23, 1878, in which 260 members of the Imperial Guard of the Imperial Japanese Army mutinied and killed officers.
 The motivation for the incident was the desire of those individuals to be paid for their part in quelling the Satsuma Rebellion.
 The rioters were stationed at the Imperial Guard headquarters in Takebashi, which was just north of Akasaka Palace.
 The rioters were planning on burning down the palace.
 The government executed 53 of the rioters after putting down the mutiny.
The Seattle riot of 1886 occurred on February 6–9, 1886, in Seattle, Washington, amidst rising anti-Chinese sentiment caused by intense labor competition and in the context of an ongoing struggle between labor and capital in the Western United States.
 The dispute arose when a mob affiliated with a local Knights of Labor chapter formed small committees to carry out a forcible expulsion of all Chinese from the city.
 Violence erupted between the Knights of Labor rioters and federal troops ordered in by President Grover Cleveland.
 The incident resulted in the removal of over 200 Chinese people from Seattle and left 2 militia men and 3 rioters seriously injured.
Riot control refers to the measures used by police, military, or other security forces to control, disperse, and arrest people who are involved in a riot, demonstration, or protest.
 If a riot is spontaneous and irrational, actions which cause people to stop and think for a moment (e.g. loud noises or issuing instructions in a calm tone) can be enough to stop it.
 However, these methods usually fail when there is severe anger with a legitimate cause, or the riot was planned or organized.
 Law enforcement officers or military personnel have long used less lethal weapons such as batons and whips to disperse crowds and detain rioters.
 Since the 1980s, riot control officers have also used tear gas, pepper spray, rubber bullets, and electric tasers.
 In some cases, riot squads may also use Long Range Acoustic Devices, water cannons, armoured fighting vehicles, aerial surveillance, police dogs or mounted police on horses.
 Officers performing riot control typically wear protective equipment such as riot helmets, face visors, body armor (vests, neck protectors, knee pads, etc.), gas masks and riot shields. However, there are also cases where lethal weapons are used to violently suppress a protest or riot, as in the Boston Massacre, Haymarket Massacre, Banana Massacre, Hungarian Revolution of 1956, Kent State Massacre, Soweto Uprising, Mendiola Massacre, Bloody Sunday (1905) and Bloody Sunday (1972).
Daniel C. Carpenter (1815 – November 15, 1866) was an American law enforcement officer and police inspector of the New York Police Department.
 He was one of earliest leading detectives on the police force during the mid-19th century and also had a prominent role in the Police Riot of 1857 and New York Draft Riots in 1863.
 His successful defeat of the rioters was the largest, and perhaps most crucial, battle during the riot.
 Fought in front of the Metropolitan Police headquarters, Carpenter's victory saved the New York financial district from falling into the hands of the rioters.
The Knoxville riot of 1919 was a race riot that took place in Knoxville, Tennessee, United States, on August 30–31, 1919.
 The riot began when a lynch mob stormed the county jail in search of Maurice Mays, a mulatto man who had been accused of murdering a white woman.
 Unable to find Mays, the rioters looted the jail and fought a pitched gun battle with the residents of a predominantly black neighborhood.
 The Tennessee National Guard, which at one point fired two machine guns indiscriminately into this neighborhood, eventually dispersed the rioters.
 Newspapers placed the death toll at just two, though eyewitness accounts suggest it was much higher.
Curtiss-Southwest Field was an airport outside Tulsa, Oklahoma.
 During the Tulsa race riot, it was the origin of planes that harassed African America rioters.
 It was run by the Curtiss Southwest Airline Company during its operation.

Question: Curtiss-Southwest Field was the origin of planes that harassed African America rioters during a riot that occurred on which days ?
Answer: May 31 and June 1, 1921