WHO: Mayor Michael A. NutterrnCommissioner Charles RamseyrnDistrict Attorney-Elect Seth WilliamsrnrnWHAT: Mayor Nutter, Commissioner Ramsey, and District Attorney-Elect Williams will warn residents of the risks associated with New Year’s revelry.rnrnWHERE: Hallway in front of the Mayor’s Office, City HallrnrnWHEN: Thursday, December 31, 2009 10:30 am