Photo of August’s D.C. Jam Session D.C. United is hosting another D.C. Jam Session, the free concert/chowdown/beerfest that complements the RFK match-day experience. Scheduled for October 4 from 2:30 to 7:30 p.m., before United takes on Chivas USA, the Jam Session will feature tons of food, five bands on multiple stages, games and a special party area for kids. Best of all, admission is free. For those of you really planning on making a…