You might be able to catch one of the members outside near the staff parking lot after the show if you are lucky. I saw most of the band members in the parking lot attached to the venue after the show.
Artist(s) usually don't do anything after their shows... perhaps an encore, but then book it. Young MA fans would know best, BUT, as far as venue, it didn't happen when I went to a friend's concert, and I usually take pictures and chill with them, but not that one time, maybe because of the venue, maybe a million other reasons.
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