Pop Quiz on judicial proprieties

Citing a conversation with a former FISA Court judge, Margo Schlanger reports that there is "an annual lunch bringing together FISA Court judges and legal advisors (and the Chief Justice) with the heads of the CIA, NSA, and FBI" (Schlanger, "Intelligence Legalism and the National Security Agency's Civil Liberties Gap," 6 Harvard National Security Journal, 122,166 (2015).) I understand that official Washington is a rather small town, and judges bump into executive officials all the time (a point Justice Scalia made in his opinion on recusal in the Cheney case). This strikes me as relevantly different. On a scale from "completely appropriate" to "wildly inappropriate," where do you place this annual lunch?