Gotta question about SEMA cars

[NOPANTS68]

Every year I walk around what I believe to be the greatest automotive spectacle, and wonder how those cars get there. More specifically, how are they chosen for the products or companies they represent? Booth space is crazy money there, so I'm sure the decisions made are critical. Do people shop their cars to vendors to get the opportunity to display something there? Do vendors have an agenda referencing what they want displayed, then seek out cars that fit? The wife and I have decided that it's on our bucket list to show something there. During last night's dinner conversation she asked how they are chosen, and I couldn't answer that. What does LatG think? Thanks in advance. Dave