From 1945: It took her a long time to go social, but Sonja Henie finally cracked out with Hollywood’s first post-war party. She gave it the works! There was a buffet supper served inside a huge tent. A dance floor, music, and not coin a phrase, more stars than there are in heaven. Clark Gable was with Anita Colby–not serious (they say) but having such fun together. Joan Fontaine and Mrs. Ronald Colman wore the same “exclusive” gown, which didn’t make Joan too happy. Joan Crawford and Phil Terry arrived early, left early and danced only with each other. They missed the best impromptu floor show pit on by Danny…