Curb Your Enthusiasm wrote Lin-Manuel Miranda and Judge Judy into the show before checking in to see if they were available

The Hollywood Reporter

“You think that the hard part is actually writing the shows, but then you realize that once you've written it, and you've written it for someone specific, that you then need that person,” says executive producer Jeff Schaffer. “Scheduling becomes the hardest thing, because he's one of the most sought-after people on the planet. Luckily, he's a fan of the show and was super excited to do it,” he adds of Miranda, who first met David when David did his Broadway show, A Fish in the Dark.