There are a lot of resell groups on Facebook. I go to a fair number of edm shows and there are at least two that i am a member of. Colorado ticket exchange is one of them I believe. There are definitely scammers on these groups but there are ways to watch out for and avoid them. Each group should have a list of "reputable sellers". You can often find sold out tickets or get them at face value or less because the community is all avid music lovers and just want to spread good vibes.