Jem Aswad Senior Music EditorOn Sept. 13, Carl Cox, Pete Tong and Roger Sanchez are just three of the legendary DJs who will take part in “For Beirut,” a 12-hour-long livestream event presented by Electronic Labor Day and Beatport ReConnect to raise funds to support Lebanon and its people in the wake of the August 4 explosion that killed more than 200 people and leveled a large area of the city.