By Finn R. Berard and Lia E. Shepler, Crimson Staff Writers C rimson Jam, Harvard’s annual back-to-school concert, took over the Yard on Sept. 4. For its first year being organized by Harvard College Live — an offshoot of the College Events Board — organizers tapped Grammy-nominated Swedish DJ Alesso to headline the event, which capped off the first week of classes. By Finn R. Berard and Lia E. Shepler Inflatables and other activities were set up around the Yard throughout the event.