A late night in Concord – dark, cold, crisp, harsh. The sky is cloudy, the mood is dim. Must be early August, you think, as you pull a thick scarf back over your head and drive downtown, your eyes darting back and forth, looking to make whatever scene is on hand. Maybe a raucous underground party? A raucous drag race? A raucous round of playing on or around a dumpster? None of…