Nothing in U.S. law requires private citizens to notify immigration authorities of visa violations. So the notification is burning artists who play outside of SXSW venues.

This article and headline have been updated to clarify that SXSW is not itself threatening artists with deportation.
Well of course SXSW is not itself threatening artists with deportation. Only immigration authorities can deport. SXSW is just going to TELL immigration authorities of visa violations The authorities…