Tomorrow and Friday there is a G20 meeting (Group of Twenty). G20 is a group of finance ministers and central bank governors from the 20 major economies (19 countries + the European Union). Which includes members of the G7 nations.
According to wikipedia the G20 group accounts for 80% of the gross world product, 80% of the world trade and 67% of the world population.
While its not an institution, the initiatives from the G20 could have a large impact in the currency market.
Anyway, our friend from FxStreet made this cool infographic of everything you need to know about the G20 and its members.