Metropolitan Events(MN) interview questions

Red Flag #1: I avoided applying to their job posts for a long time because they didn't have a website for the longest time. Finally there was one point where all of a sudden they not only had a website but also every single social media account they could possibly have. I investigated all of these. The website didn't really answer what they did exactly, just showed that hey the employees traveled to a conference. Their Facebook posted a bunch of fluff; business inspiration quotes, random posts about conferences, etc. Red Flag #2: I decided to apply just in case they were legitimate. Someone called and asked me several questions over the phone and then afterwards asked me if I would come in for an interview. When I arrived at the office suite in the suburbs I looked at the office building directory and noticed that where the office was for Metropolitan Events it didn't match their company name. It just said "Marketing & Sales". Red Flag #3: They must have asked quite a few to come and interview around the same time since there was one person interviewing when I got there and three others that were waiting after myself. When I came out after my interview there several more people there too. Red Flag #4: The interviewer deflected all the questions I had for her about the company and the position citing that "this is only a preliminary interview". Never before had I ever received that answer from anyone interviewing me at any stage of an interview. Red Flag #5: She said they were looking to have a training class of people to train to become managers in the next six months to a year. The way she phrased it, it sounded like they were going to train 10 or so people to become managers. Their office space was one office, a waiting room, a room for storage, and if I remember correctly maybe one additional door that I didn't see into. Basically at the moment they are clearly not large enough to warrant that 10 managers in the near future. Red Flag #6: She told me she would be in contact later that afternoon, 2:30 or 3:00 at the latest (I interviewed at 9:00) whether or not I would be asked in for a second interview. This second interview would be more in-depth and be hands on. Nail in the Coffin: I was invited for a second interview that was to take place at Costco or Sam's Club (I can't remember which) for a few hours. I emailed and declined the second interview. Making assumptions, I'm assuming that they they wanted me to 'interview' for a few hours at Costco or Sam's Club and sell people stuff at a table. And since they called it an 'interview' they would get some free labor.