When President Barack Obama arrived at the Sony Pictures lot in April for a Democratic National Committee fundraiser, most studio employees left early and traffic was tricky. Tonight, it’s the First Lady’s turn. Michelle Obama will attend a fundraiser and discuss the 2012 re-election effort at the home of Michael S. Smith and James Costos. It starts at 6 PM tonight. Among those in attendance will be Linda Lichter, Peggy Lipton, Michael Patrick King, Donna Roth, Suzanne Todd, Jeff Robinov, Bryan Lourd, Roger Birnbaum, Peter and Megan Chernin, Brian Grazer, Kevin Huvane, David and Lona O’Connor, and Ellen and Portia DeGeneres.