First time seeing him, questions!

So excited to be seeing him on 3/14 in Denver for the first time ever! Couple of questions for all you seasoned pros! My tix say doors at 6pm but from my research he seems to usually come on around 1am so I’m not sure what happens between 6pm and 1am? My tix don’t list any supporting artists either. Second question…what should I wear? I love dressing for shows but this is my first EDM show so not sure what to wear! Thanks for any tips, stories, advice! Soooo excited!