Machine Gun Kelly, Princess Nokia and more acts have been forced to cancel their appearances at the inaugural ALT+LDN festival in Clapham, London.Coronavirus restrictions have meant that Kelly, Nokia and other acts Chase Atlantic, Lil Skies and Mario Judah will no longer perform at Monday’s (August 30) event.Festival organisers said in a statement posted to Instagram: “Due to the continuing concerns over COVID-19 and international travel, Chase Atlantic, Lil Skies, Machine Gun Kelly, Mario