Some discussion: https://community.metabrainz.org/t/advice-on-events-and-setlists/723103/5

My thought for setlists is that they could be similar to mediums, except the left column would allow linking to works. The ultimate idea would be a new entity similar to tracks, which in my head I'm calling "performance" (but I can imagine there might be a better option). So release:medium:track::event:setlist:performance

• Like mediums, you could have multiple setlists per event, if needed
• Like mediums, you could have an overall artist for a setlist and edit artist credits individually, as needed
• Probably also need the ability to say "don't know the contents of this setlist," as with mediums
• Both a setlist and a performance could be tied to an artist's event page
• A performance could be tied to a work page (maybe a setlist, too, if it's a whole work)
• I'd love to see some way to incorporate performer / instrument relationships similar to recordings, but it's harder to imagine how that would work.