COVID-19 experiment.The show, which saw Spanish rock band Love of Lesbian playing at the Palau Sant Jordi arena, is said to be the biggest concert in Europe since the pandemic began last year.All attendees at the gig, which went ahead with the permission of health authorities in Spain, were tested ahead of the gig at three locations across Barcelona, with three of the first 2,400 people tested coming back with positive results and not attending the evening’s show.The antigen test results were reported back to the attendees within 10 to 15 minutes via an app on their phones, and the ticket price of around $23 (£20) came with a rapid test and mask included..