Long Beach Convention Center opens as temporary facility for unaccompanied migrant children On a tour of the Long Beach Convention Center, Mayor Robert Garcia speaks in the sleeping quarters set up for migrant children inside Exhibit Hall B. (Brittany Murray / Pool Photo) April 22, 2021 6:38 PM PT Print Federal officials on Thursday prepared to receive 150 migrant children at the Long Beach Convention Center, one of several structures in California and other states being repurposed as temporary intake facilities to cope with an overflow of unaccompanied minors at the southern border. Sleeping areas were set up inside the Convention Center’s exhibit halls, with rows of cots draped with white sheets and stacked with folded blankets and pillows, photos shot by a media pool photographer showed.