Press Release:  In Berkley, California this Saturday, Manny Pacquiao and David Diaz will host a free public workout and autograph session at WestWind School for their upcoming lightweight title fight.  Promoted by Top Rank in association with MP Promotions, Pacquiao-Diaz will take place Saturday, June 28, 2008 at Mandalay Bay Resort & Casino,  Las Vegas,  Nevada.   The 12-round lightweight bout will be produced and distributed live by HBO Pay-Per-View, beginning at  9 P.M. ET /6 P.M. PT.