Here is the obvious example: https://beta.musicbrainz.org/event/8fcc13cf-fa69-4293-8af3-e96e387d708b/event-art

What about "evolving" lineup posters? The festivals start with the first wave of artists and with the time there will be more artists announced which will be added to the poster.

But I think differentiation is also possible:

• "Full Lineup": https://beta.musicbrainz.org/event/8fcc13cf-fa69-4293-8af3-e96e387d708b/event-art
• "Full Lineup by Days/Stages": https://beta.musicbrainz.org/event/81eb99d7-5c1c-49d8-a985-01946ea3a214/event-art
• "Linup Announcement" (containing only new artists): https://beta.musicbrainz.org/event/183ba1ec-a87b-4c0e-85dd-496b7cea4399/event-art
• "Ongoing Linup" (contains all already known artists): same as above, see comment of event art