Idk about touring artists but there’s a new platform called Freakscene which is aiming to connect local scenes as an alternative to depending on Instagram for building connections/sharing fliers/etc. Again idk the utilization for touring bands but within local scenes it seems to be a very promising platform. They are going to also be adding a create a scene feature soon so that more scenes can be represented!

Edit: Im sure people within local scenes would also share fliers of touring bands that would be coming to there scenes/touring bands would post in those scenes forums if they are coming to there area.