Fashion week is a marathon, not a sprint. With shows from day to night, and parties until the wee hours of the morning, serious stamina is required, especially when some of the chicest events are left for the final evening. Francisco Costa and the Calvin Klein team hosted a very intimate dinner at the newly re-opened Beatrice Inn. Michael Kors celebrated his digital collaboration with photographer Clairborne Swanson Frank at the Madison Avenue boutique. Uptown at the Guggenheim Museum, Nick Knight and Steven Klein hosted a fÃªte fit for the most eccentric of musicians â a black tie masquerade ball for Lady Gaga’s Fame fragrance launch. See the best photos from the last night of New York Fashion Week. Plus peruse all of the parties and front row coverage from earlier in the week.