A pop-up dance party tucked beneath a Los Angeles freeway overpass is drawing crowds, colorful characters, and plenty of online chatter. Videos circulating on social media show what one attendee described as “ Cue humans being absolute cutie pies ,” capturing a lively gathering of roughly 100 people dancing, lounging and celebrating in a gritty, unexpected setting some identified as the LA River . Originally the primary water source for Los Angeles , the LA River was encased in a concrete flood