Johannes Mehserle's trial begins Monday, May 18, 8 a.m.-5 p.m. at the Alameda County Courthouse, 12th and Oak Street, in Oakland. A strong community presence has been requested by the Oscar Grant family and allies. A teach in to prepare for the trial is Sunday, May 17, 1-4 p.m., at Humanist Hall, 390 27th St., Oakland. And wish Tatiana Grant happy birthday. She turns 5 on May 16.