The previous summit in Hamburg , Germany , met with huge protests , with cars set on fire and roads blocked by protesters . The 2018 summit has reinforced security , to prevent a repeat of those protests . Local left-wing organizations are planning protests and have called for foreign activists to join them . The Argentine government , working alongside the others , is attempting to prevent the entry of troublemakers into the country , such as people with criminal charges or who have advocated for violent actions . Only peaceful protests will be allowed . Federal Security Minister Patricia Bullrich said that " We will not permit illegal acts . Those who want to cross the line will have to face the legal consequences " . 22,000 police and 700 security ministry agents will guard the event , working alongside the security services of the United States , the United Kingdom , Brazil , Italy , Spain and others . An area of around the will be cordoned off , the public transportation network – including the metro – will be shut down , and traffic along the River Plate will be halted . Friday , 30 November was declared a one-time public holiday day in the city of Buenos Aires , to prevent the traffic caused by people 's daily activities , and residents were urged to leave the city for the long weekend . Media Minister reported that no infiltration by international terrorist groups had been detected , and the US government said that the remote location of Argentina would discourage international protesters from travelling to the country
previous summit
2017 G20 Hamburg summit
2018 G20 Buenos Aires summit