A concert with 5,000 people in the audience has taken place in Barcelona.
Everyone had a mouth guard and had done a quick covet test that morning.
The concert was approved by the government, which in this way wants to learn more about the spread of infection at cultural events.
Anna Sjölund, who is the CEO of Swedish Live Nation, wishes that a similar test event could be held in Sweden.
- But we are happy that they are conducting this type of experiment in Barcelona because we learn and take in that information, she says.