Tickets and ticket stubs for events.

"Ticket stubs these are copies of people’s tickets after they have been processed by the venue on arrival. These are considered collectable and are a good source of evidence of not only the act but the promoter, the price, the start time and sometimes even any support acts"
- sound.and.vision

Example EAA image: https://beta.musicbrainz.org/event/a350d5fd-4481-43c1-8eab-57fe5e55b8f3/event-art