Covid-19 transmission in large crowds did not cause any detectable spread of the virus, research has confirmed.More than 13,000 people were in attendance as the city held two nightclub events, a music festival and a business conference at the end of April and beginning of May.Data shows that 11 people tested positive for coronavirus, though less than half of attendees sent back a PCR test to labs after the event.The trials have now been hailed as “undoubtedly a success” by Liverpool public health director Matt Ashton.The first stage of the government’s events research programme saw thousands of music lovers attending a series of pilot events in Liverpool over the May Bank Holiday weekend, where the likes of Fatboy Slim and Blossoms played.