Yeah, the last known one was in 2000 and included Bonanno boss Joseph "Big Joey" Massino, Bonanno underboss Salvatore "Good Looking Sal" Vitale, Genovese ruling panel member Lawrence "Little Larry" Dentico, Gambino acting boss Peter "Petey Boy" Gotti, Lucchese acting boss Louis "Louie Bagels" Daidone, and Colombo consigliere Joel "Waverly" Cacace.

Whether one wants to consider that an actual Commission meeting or not is another debate.

To the original point, there would be no reason, and extremely unlikely, for the NY families to meet with Chicago or Detroit.

I could be forgetting but I don't recall any details about a meeting in 2004 though I wouldn't be surprised if meetings similar to the 2000 one happened since.