Came here to say the same thing. I wrote an app that was exactly this almost 10 years ago now, but couldn’t get it to go anywhere. I remember all the other companies you listed as well.

Touring is logistically complicated and there’s likely a software solution that could help ease the pain for tour managers and venues, but crowdfunding a show to show interest in a city is maybe the least of the worries of an artist planning a tour.

But I’d be happy to be wrong and hope the founder has success!