The Great Event is over, but snapshots of some of those New York Harbor celebrity bashes thrown for Miss Liberty and the Fourth should fill many a star-spangled album. One exclusive affair, aboard Pierre Cardin's plushy yacht, Maxim's des Mer, drew the likes of Esther Williams, Michael York and Kirk Douglas. Michael J. Fox weighed in with a Canada Day Salute to Lady Liberty party on Pier 16, drawing such northern neighbors as Colleen Dewhurst, Lorne Greene and comedian Rich Little. Then there was MTV's ferry hoopla, which surely was the longest (4 p.m. till midnight) and probably the loudest: Rockers ZZ Top played for close to 400 stars and fans on board and a floating audience on boats all around. Said Don Johnson, who came for the fireworks but soon tired of all the star-shooting paparazzi: "If I pose for another picture, shoot me."