i went to their house today, for that petition against animal cruelty. And, well they dont have a doorbell. but they made a new one. but without a battery. so i knocked, but no respond. They have chickens and a dog too. They might be all alone then.. Well ill check that exhibition.
Perhaps you should just leave them alone...if they want to keep themselves to themselves, they should be left to get on with it. Perhaps if they sell their art you could meet them that way.
if they dont answer the door and dont have a doorbell or dont show themselves....it kinda sounds like they don't want to be bothered. but do as you please.