Decadence at the Colorado Convention Center on December 30.
For EDM fans, there is nowhere else to be on December 30 or 31 besides Decadence, the self-described largest New Year's Eve festival in the U.S., at the Colorado Convention Center. This year's lineup includes such heavy hitters as Bassnectar, Alison Wonderland, Marshmello, Skrillex and more. Night two kicks off today, December 31. Remember, kids: Drink water and don't buy drugs from strangers.