Two more Democratic presidential contenders have committed to participating in a public education forum Saturday in Pittsburgh, bringing the total to 11. U-S Senators Michael Bennet of Colorado and Corey Booker of New Jersey have joined six other Democratic presidential candidates who are expected to attend the event. A coalition of progress groups is organizing the Public Education Forum 2020: Equity and Justice for All. The event starts at 10 A-M at the David L. Lawrence Convention Center in Pittsburgh.