my best guess is, since it was ‘country night’ they were doing what everyone else was doing - linedancing. Until the shooting started - and then they were getting people upstairs, out doors, out windows and up in the rafters out of the line of fire. This is an all-age place that draws teens through the elderly.
There were a lot of people there (60+) that were also at Vegas.
I hear Don liked to play darts and was a good man all around. RIP, Sir.