With event image file support coming up (and even if it wasn't) it would be great to be able to credit artists and designers for show posters.

Let's add some more [artist] - [event] relationships!

I think it makes sense to keep everything the same as the [artist] - [release] relationships, just swap out 'release' for 'event'. Potentially we could do 'event poster' instead, but MB editors are a pernickety bunch, and I'm sure it will be mentioned that stuff like Facebook event banners or digital tiles aren't technically 'posters', so maybe it's better to keep it broad. I'm not sure.

art direction
This indicates an artist that did the art direction for the event.

artwork
This indicates an artist who provided artwork for the event when no more specific information is available.

design
This indicates an artist who did design for the event.

graphic design
This indicates an artist who did the graphic design for the event, arranging pieces of content into a coherent and aesthetically-pleasing design.