How to allow audiences to encounter someone who cannot travel but whose presence in 'the here and now' would be crucial?
People in prison, people on the run, dead people, the name/voice/face-less oppressed...
'If only they could be here, if only we could share a moment with them here.'
What kinds of yearning-in-absence can live artists respond to with their skills?
Kate Moss... Billie Whitelaw...
There's also the example of Tupac Shakur playing live at Coachella.
Presence which theoretically should not be present is a very intense form of liveness.
The spectre of death (conjured into the now) is very 'live'.