See https://musicbrainz.org/edit/55552546
This is a group artist that was created based on a single event/performance, and gathers together the people who performed.
My feeling is that this should be an event instead (which also allows linking the performers), and that the same would apply if this was a theatre tour and not just a one-off performance.
However, I’m not inclined to enter a delete edit for it unless there is some consensus on the matter; the style guidelines don’t seem to provide much guidance in this case (at first glance).