Leaders from around the world are arriving in the Washington area for the annual G8 summit, which begins Friday at Camp David in Maryland.
It includes leaders from Canada, France, Germany, Japan, Russia, Italy and the United Kingdom.
One of the biggest issues facing the summit this year is the ongoing economic and political problems in Europe, including the Greek crisis.
There are a few changes from last year’s G8 summit.
Despite winning his country’s election two months ago, Russian president Vladimir Putin will not be attending. Putin says he’s still putting together his cabinet, and will send Prime Minister Dmitry Medvedev in his place.
It’s also the first summit for newly elected French president François Hollande, replacing Nicolas Sarkozy.
There are concerns about riots in Frederick, which is about 20 miles away from Camp David and the closest city to President Barack Obama’s compound.
City officials are preparing for the possibility of riots and flash mob protests but insist that peaceful demonstrations will be allowed.
Protesters are planning an Occupy G8 People’s Summit on Friday and a block party the next day.