I think a couple of folks mentioned the temporary White Castle on Sunset across from the Standard. I went there yesterday expecting a huge line (after all, the burgers are free). Instead there was no one there. I got my one free burger (no fries, no drinks). It tasted OK in the bland White Castle-y way, and it would have been much improved by cheese. I'm not rushing back; I think there's a good reason these east coast chains have never attmpted to conquer the land of In-N-Out: they just couldn't compete here.
There were a number of empty bean bag chairs to the side. It felt like a party that just wasn't happening.
Overall, whoever was responsible for this promotion seems to have failed dismally.