I've not come across the 'mixer' expression before, but a 'Taxi Quickstep' is very much the same thing. Ladies line up, as at a taxi rank, and gentlemen dance with the lady at the front of the queue, once around the floor, dropping her off at the back of the queue, before 'collecting' his next lady.
I can't see it working for AT!
I can't see it working for AT!