Who wants to see Hardwell, the No. 1 DJ in the world? Now, how about seeing him with 19 of your closest friends on Halloween? If this sounds like an awesome time to you, then hit up this contest! Grab some friends and dress up in the Halloween costume you would wear to UIC Pavilion in Chicago, take a photo, then upload it to the #Hardwelloween App to enter for your chance to win 20 tickets!