Hi gang, Sorry for late notice: Will Allen, founder of Growing Power in Milwaukee, will be a keynote speaker at the Sustainable Food & Farm Conference this weekend in Grass Valley.  He's on at 4:30 this afternoon (til 6?).   Also at the conference tomorrow (Sunday) from 2:00 to 2:45 pm, Pierre Beauchamp, a 17-year old with an award-winning aquaponics setup at a high school in Loomis, will b…