If you were trying to sneak in that last-minute meeting at Sony Pictures before heading off for the holiday, think about rescheduling. President Barack Obama will be coming to the lot for a Democratic National Committee fundraiser. Security considerations and restrictions of movement will prompt the studio to close at 2 PM today, but the promise of gridlock in Culver City and security considerations in general has led many to plan to make themselves scarce a lot earlier than that. The lot is closed tomorrow for Good Friday.