The One Young World summit began Thursday in Pittsburgh.
The five-day event will bring young leaders from nearly 200 countries together to discuss world problems and solutions.
“This is an opportunity once again for our city to shine and introduce itself to 1,500 young people from over 180 countries. Pittsburgh is in the middle of its third renaissance, and to get a chance to show that and share that with the rest of the world is really exciting,” said Pittsburgh Mayor Luke Ravenstahl.
The summit is being held at the David L. Lawrence Convention Center and other sites throughout the city.
Former U.N. Secretary General Kofi Annan is scheduled to speak at the summit.
Annan will speak at the event on Sunday, addressing about 1,200 delegates to the convention from 190 countries.
Federal Street from Isabella Street and the Clemente Bridge to the Fort Duquesne Boulevard will be closed midnight until 6 a.m. Friday to vehicle and pedestrian traffic.