07/31/10 The historic hamlet of Rhinebeck, N.Y., was put back on the map, thanks to today’s wedding of Chelsea Clinton and Marc Mezvinsky .  The in(n) crowd stayed at the Beekman Arms, founded in 1766; George Washington slept here. Townspeople mixed with curious weekend visitors and the media horde outside places such as the Delamater Inn — all hoping for a glimpse of invited guests like Ted Danson and Mary Steenburgen. Shop windows displayed congratulations to the newlyweds, who will tie the knot this evening at the Astor Courts estate on the Hudson River.