2009 G20 London summit a force for good in the medium term." Leaders of the member countries began to prepare for the London Summit months before the effective date, notably with two official meetings dedicated to that preparation, one held in Berlin, Germany, on 22 February 2009 for European leaders, and another in Horsham, Sussex, United Kingdom, on 14 March 2009 for Finance Ministers. Leaders of the four European Union member countries of the G20, the United Kingdom, Germany, France and Italy along with the two largest European non-members, Spain and the Netherlands, met in Berlin on 22 February 2009 to prepare for the
2017 G20 Hamburg summit hours, prompting the deployment of special armed police forces to end the violence. On 8 July 76,000 people attended the largest peaceful protest march "Solidarity without Borders", organized by an alliance of 174 groups and organizations. On early Sunday morning, 9 July, riots continued in the Schanzenviertel though the G20 leaders had already departed; 144 rioters were arrested. In total, more than 15,000 police were deployed from across the country, while 100,000 protesters attended. Local residents believed that authorities made a mistake by having the summit in a densely populated area. Police arrested 186 people overall: 132 Germans, 8 French,