Shake the tinsel off this holiday season. Chicago DJ vets J2K and Autobot have been attacking booties with dirty bass for years. There's always been a heavy hip-hop flavor to their low-end dancefloor assaults, and recently a greater delving into trap. Iggy Azalea, Waka Flocka Flame and Travis Porter have appeared on recent productions. You gotta be of voting age for the Aragon gig, while only those of drinking age are in at the Mid.