Yesterday, the Museum of Modern Art held its annual Party in the Garden benefit honoring Mayor Michael R. Bloomberg and the artists Ellsworth Kelley and Cindy Sherman, and sponsored by Cartier. Dinner was held in the Agnes Gund Garden Lobby, where guests included Francisco Costa, Caroll Dunham, Jeff Koons, Helen and Brice Marden, Matthew Marks, Claes Oldenburg, and event co-chairs Diane von...