Thousands of people are gathering at the Washington Convention Center in Downtown D.C. this week for the second annual AI+ expo.

Washington Convention Center, Mellon Auditorium and the White ... "It was a little dystopic-looking outside," he explained. "The walled-off corridors and checkpoints and police everywhere." ...

Families with babies in strollers, students, elected leaders and others holding signs and flags joined the march to the United Center, where the convention ... porches and outside their doors ...