COVID-19 pandemic in the United States COVID-19 pandemic in California Los Angeles County begins mandating face masks for all people who attend outdoor "mega-ev
COVID-19 pandemic in the United States COVID-19 pandemic in California Los Angeles County begins mandating face masks for all people who attend outdoor "mega-events" of more than 10,000 people such as open-air concert and sporting events regardless of their vaccination status. (Spectrum News 1)