William Powell and Myrna Loy of course (yeah, I'm thinking really in Nick and Nora Charles). And Clark Gable and Carole Lombard. Lucille Ball and Desi Arnaz (he would be in charge of the music obviously). I'd invite Peggy Lee and Frank Sinatra to sing some of their hits. Gene Kelly, Fred Astaire, and Ginger Rogers to show some moves. Oh, oh, and Bette Davis and Joan Crawford :) I would go with Cary Grant so we two will laugh about all the craziness around, while S. Z. Sakall tell us some interesting gossip. Everyone would go —just like in Well, did you Evah? lyrics— "what a swell party this is!".