In the law firmsSidley Austin LLP advised The Navigators Group Inc. in its $2.1 billion agreement to be acquired by The Hartford Financial Services Group Inc. The deal was announced Wednesday.The Sidley attorney group included Suresh T. Advani and Gregory A. Marrs as well as Michael A. Gordon, Kirk D. Lipsey and Gabriel Saltarelli (all three New York).In the bar groupsThe Federal Bar Association Chicago chapter issued an invitation to practitioners and students for lunch with U.S. Magistrate Judge Sheila M. Finnegan on …