They own the URL
Fillmoreauditoriumdotorg
THEY ARE NOT THE FILLMORE AUDITORIUM IN DENVER!
The website is completely deceptive. They masquerade as the official website of The Fillmore Auditorium. They make statements on the website like, "don't buy your tickets from anyone else. Because they will tack on fees". The truth that they ARE NOT The Fillmore Auditorium is buried DEEP in the website where you won't find it until you realize that you've been scammed.
Why would anyone try to trick people into thinking that they're a business in Colorado when they are in Florida? Their email signature uses a fake address that isn't registered to a business in the state of Florida.
The red flag for me was when a rude, aggressive woman called me early on a Sunday morning and started asking for a lot of personal info. When I questioned her she started yelling at me that she didn't like the sound of my voice to try and make me compliant with her scam.
AVOID TICKET MONSTER!
They call from a FL number. They provide a fake Orlando, FL address. Neither the company name or the address provided belongs to legitimate company that is registered with the FL Secretary of State.