Question: When is the MacRobertson International Croquet Shield Tournament contested?
About the article "Croquet", section "Association".

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The MacRobertson International Croquet Shield is the premier croquet teams event in the world.
It is currently competed for by Australia, England, New Zealand and the United States.
It is known affectionately as the "MacRob" or just the "Mac".
The series is now played in rotation between the competing countries every three or four years.
The next series will be held in 2017 in the USA. 
The 2013-14 series was contested in New Zealand across 4 different venues.
"Mon 30 December - Fri 3 January": New Zealand v USA and England v Australia at United Croquet Club, Christchurch"Sun 5 - Thu 9 January": England v USA at Te Mata Croquet Club, Havelock North and New Zealand v Australia at Marewa Croquet Club, Napier"Sat 11 - Wed 15 January": New Zealand v England and Australia v USA at Mt Maunganui Croquet Club, Tauranga 
The 2010 Shield was contested in Great Britain, across 5 different venues.
"Fri 6 – Tue 10 August": Great Britain v USA at Bowdon, Greater Manchester and Australia v New Zealand at Heaton Park, Manchester"Thu 12 – Mon 16 August": Great Britain v New Zealand at Nottingham and Australia v USA at Roehampton"Wed 18 – Sun 22 August": Great Britain v Australia and New Zealand v USA both at SurbitonEach team is represented by 6 players and each test is the best of 21 matches comprising 12 singles and 9 doubles.
Also in 2010, for the first time, the 4 MacRobertson Shield countries were joined by 13 other countries in an inaugural WCF World Association Croquet Team Championship.
The MacRobertson Shield was Tier 1 and the other 13 entries were split into three further tiers based on playing strength.
"Mon 16 - Sat 21 August: Tier 2 Division 1": The next four countries played at the Hurlingham Club, London.•Tier 2.1 winner Wales "Mon 16 -Sat 21 August: Tier 2 Division 2": The next four countries played at the Compton Croquet Club, Eastbourne, East Sussex.•Tier 2.2 winner Scotland "Wed 18 - Sat 21 August: Tier 3": The remaining five countries played at the Sussex County Croquet Club.•Tier 3 winner Czech Republic 
In the early 1920s, Australian confectionery maker and philanthropist, Sir Macpherson Robertson played croquet as his pastime.
He enlisted returned World War I veterans to take up concessions for his products and encouraged them to try croquet also, believing it to be a teaching aid for developing skills in self-discipline and risk management.
Eventually, a pool of players were participating in regular tournaments.
In 1925, with a growing interest in the sport, he established the MacRobertson Shield, an international tournament of croquet "Tests" between Australia and England.
The Victorian Croquet Association sent a team of four players to England to contest the inaugural tournament.
England won easily and Robertson presented the Shield personally.
In 1927-8 an England team played in Australia and was narrowly defeated.
In 1930, New Zealand was invited to participate in a series between themselves and Australia, with Australia winning comfortably and the first triangular series was held in 1935 in Melbourne as part of the Melbourne centenary celebrations.
In 1993, a United States team was admitted into the tournament.
Between 1974 and 2010 the team representing the Croquet Association was named Great Britain and in two series Great Britain and Ireland, because the teams included players from Scotland, Wales and Ireland.
From the 2013-14 series the team will be named England and will only included English qualified players.
This is following the introduction of the WCF World Association Croquet Team Championship. 
Association croquet is the name of an advanced game of croquet, played at international level.
It involves four balls teamed in pairs, with both balls going through every hoop for one pair to win.
The game's distinguishing feature is the "croquet" shot: when certain balls hit other balls, extra shots are allowed.
The six hoops are arranged three at each end of the court, with a centre peg.
In association croquet one side takes the black and blue balls, the other takes red and yellow.
At each turn, players can choose to play with either of their balls for that turn.
At the start of a turn, the player plays a stroke.
If the player either hits the ball through the correct hoop ("runs" the hoop), or hits another ball (a "roquet"), the turn continues.
Following a roquet, the player picks up his or her own ball and puts it down next to the ball that it hit.
The next shot is played with the two balls touching: this is the "croquet stroke" from which the game takes its name.
After the croquet stroke, the player plays a "continuation" stroke, during which the player may again attempt to make a roquet or run a hoop.
Each of the other three balls may be roqueted once in a turn before a hoop is run, after which they become available to be roqueted again.
The winner of the game is the team who completes the set circuit of six hoops (and then back again the other way), with both balls, and then strikes the centre peg (making a total of 13 points per ball = 26).
Good players may make "breaks" of several hoops in a single turn.
The best players may take a ball round a full circuit in one turn.
"Advanced play" (a variant of association play for expert players) gives penalties to a player who runs certain hoops in a turn, to allow the opponent a chance of getting back into the game; feats of skill such as triple peels or better, in which the partner ball (or occasionally an opponent ball) is caused to run a number of hoops in a turn by the striker's ball help avoid these penalties.
A handicap system ('bisques') provides less experienced players a chance of winning against more formidable opponents.
Players of all ages and both sexes compete on level terms.
The World Championships are organised by the World Croquet Federation (WCF) and usually take place every 2 or 3 years.
The New Zealand team won the last MacRobertson International Croquet Shield tournament, which is the major international test tour trophy in association croquet.
It is contested every three to four years between Australia, Great Britain, the United States and New Zealand.
Historically the British have been the dominant force, winning 14 times out of the 20 times the event has been held.
In individual competition, the UK is often divided by subnational country (England, Northern Ireland, Scotland and Wales).
Unlike most sports, men and women compete and are ranked together.
As of 2013, the Association Croquet World Champion is Robert Fletcher of Australia and the Women's Association Croquet World Champion is Jenny Clarke of New Zealand.
The world's top 10 association croquet players as of February 2014 are Robert Fletcher (Australia), Chris Clarke (New Zealand), Reg Bamford (South Africa), Paddy Chapman (New Zealand), Aaron Westerby (New Zealand), Greg Bryant (New Zealand), Toby Garrison (New Zealand), Robert Fulford (England), David Maugham (England), and Jamie Burch (England).
Three women have won the British Open Championship: Lily Gower in 1905, Dorothy Steel in 1925, 1933, 1935 and 1936, and Hope Rotherham in 1960.
While male players are in the majority at club level in the UK, the opposite is the case in Australia and New Zealand.
The governing body in England is The Croquet Association, which has been the driving force of the development of the game.
The rules and tournament regulations are now maintained by the International Laws Committee, established by the croquet associations of England and Wales (CA), Australia (ACA), New Zealand (CNZ) and the United States (USCA).