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 the city of Hamburg. They included an alternative "Global Solidarity Summit" from 5 to 6 July and a peaceful dance-protest-march "Lieber tanz ich als g20" with between 11,000 and 20,000 people attending on 5 July. Around one thousand performance artists called "1000 Gestalten" covered themselves in grey pigment and slowly walked through the streets like zombies. This performance was done to draw awareness of political apathy. After walking, they all removed their grey clothes. Underneath were colourful clothes that symbolized becoming engaged and awake. On 6 July, protests turned violent when over 160 police were injured in clashes with protestors