Submitted: Jun 30, 2008 - Peter CookPhoto: Getty ImagesPeter Cook got a manicure at Spliff for Men on East 46th Street and talked on a cell phone about his divorce from Christie Brinkley. Patrick McMullan and his son, Liam, were set to host a party at Dune in the Hamptons, but the club canceled it because there was a photo of Liam smoking pot on the invite. Amy Poehler and Rachel Dratch had dinner at Vento, though Poehler…