I'll be honest I've only been to BMO one to three times in a year since 2010 and it's all rave related. ...if there was another rave that took place at BMO besides Cemetery of Sound, PURE YYC, that David Guetta show back on 05/23/14, Above & Beyond 05/08/15, Safe in Sound 10/11/14, Glitter & Gold - sorry my mind is a total blank.
The venue is pretty massive to hold such an event that usually takes a toll of about 1500 or so attendees and there's usually a lot of leg room to move/dance around.
I know BMO holds other events and there are other Yelpers who got you covered with their experience and reviews but mine is typically towards the other EDM enthusiasts in Calgary. See you all at the next massive!