For the first time in several years, the 49′ers and Oakland Raiders will hold joint-practices. Both teams announced yesterday that a morning and evening practice session will be staged on Sunday, August 4th at the Raiders’ training facility in Napa. Both sessions will be closed to the public. The teams will hook up again on Friday, August 8th as the 49ers will travel across the bay to Oakland for the preseason opener. Kickoff from McAfee Coliseum is scheduled for seven p.m.