JLS, a boy band consisting of Aston Merrygold, Oritse Williams, J.B. Gill, and Marvin Humes, will perform at the All-stars Summer Party on June 1st. Tickets for the event are available on the All-stars Summer Party website. Aston Merrygold, 24, has experience as a judge on the television show Got to Dance and the group has participated in campaigns with Cancer Research UK.