How can we request singers/groups to come to the country/city we live in?

I live in Qatar and although we've had quite a few famous people coming here to do shows (such as Enrique Iglesias, Akon, and others), there are many singers and groups that me and many other people would love (or kill!!) to have come here to do performances. I know there are websites that people can like sign petitions and stuff, so, got anything?? (Do these websites or ways to request an artist include requesting non-American artists like Korean or Japanese artists for example?? That would be great!!)