JUST IN TIME: Roberto Cavalli will be winging it to New York for Thursday night’s fashion show and party at the new Just Cavalli store in SoHo. Once models show off pre-fall in the store to the invitation-only crowd, they will step outside the West Broadway entrance for a turn or two. Calling the shindig his holiday gift to New York City, the designer will greet such guests as Heather Graham, Caitlin Fitzgerald, Zani Gugelmann, Natalie Joos and Becka Diamond among others.