G20 Summit Riots, Toronto, Canada

The heads of the G-20 nations have met semi-annually at G-20 summits since 2008. The most recent was held in Toronto on June 26–27, 2010, and the next will be in Seoul on November 11–12, 2010. Starting in 2011, G-20 summits will be held annually.
The G-20 operates without a permanent secretariat or staff. The chair rotates annually among the members and is selected from a different regional grouping of countries. The chair is part of a revolving three-member management group of past, present and future chairs referred to as the Troika. The incumbent chair establishes a temporary secretariat for the duration of its term, which coordinates the group's work and organizes its meetings. The role of the Troika is to ensure continuity in the G-20's work and management across host years.