Disclaimer: I haven't been to most of these places recently. There's been a pandemic on for the last few years and it completely closed down all of Calgary's nightclubs, so it's hard to know who's doing what after all this time or how the vibe has changed at these places.
This list is a little questionable but back in the day Hudson's downtown would have a dance floor breakout towards the end of the night that was really fun. I've heard Greta Bar has a dance floor, I haven't been though. The Trop has dancing on weekends, but note this is for an older crowd. The strippers (Blondies & Boudoir Rouge) used to have dance floors but can't confirm is that is still a thing. There was also a phase where Tropical on 17th had a popular dance floor but also not sure if that still happens.