There's already a website that can do this, it's called Eventful. I don't know if venues look at it or if they are sent to them, but you can request concerts. Just go to the performer's page and click the button that says "demand it."
Link:
Paul McCartney Concert Tour Dates and Tickets | Eventful
I'm sure that your site could be similar to that or maybe you could find out a way the make the system better, which would be my advice.