Kygo's set went OFF and they couldn't but get involved with the crowd. This image appears in the gallery:25 Of The MUST-SEE Photos From Capital's Monster Mash-Up In London 15. Kygo's set went OFF and they couldn't but get involved with the crowd. Everyone was having legit the best time. Picture: PA 25 images See the full gallery: 25 Of The MUST-SEE Photos From Capital's Monster Mash-Up In London