That was on a Thursday night.
My boyfriend had kept me out all night on Wednesday, so my parents would not let me go out on Thursday, but my classmates talked about the concert the following morning.
According to what they told me there were two performances scheduled at Crawford Hall for that date, and the first audience refused to leave, so the police showed up to direct the activities.
From the sound of it what eventually happened was that both audiences combined to pack the venue.