The World Emerges Out

Photo: Emilio Morenatti/AP

Barcelona, Spain, held a sold-out concert for 5,000 — Europe's biggest commercial audience of the pandemic era, AP reports. Why it matters:  Concertgoers passed a same-day COVID screen. The idea is to test the tests' effectiveness, along with the event's mask requirement, in preventing outbreaks from big cultural events. How it worked: Ticket buyers chose among three venues to take a quick antigen test Saturday morning. Those with negative results got a code on their cellphones validating their tickets for the 7 p.m. show.  📷 More photos.