The link to his manager is a great start. Know that most artists charge anywhere from $20,000 - $50,000 per show, plus travel, lodging, and amenities. Also, most artists won't perform private parties. But Li'l Wayne is popular, but not enough of a superstar to rule it out, either. Note that these companies get lots of fake requests, so if your proposal does not look authentic or serious it will likely be ignored. Consider a telephone call or snail-mail letter.