AMA Pro Racing Springfield TT Event SPRINGFIELD, IL Sat, May 28, 2011 Photo by Dave Hoenig Springfield_TT.jpgRound 6 of the AMA Pro Harley-Davidson Insurance Flat Track Championship, the Springfield TT, has been rescheduled for Memorial Day, May 30. The severe weather that's plagued the Midwest this spring hit the Illinois State Fairgrounds full force at around 2 p.m. Saturday, forcing AMA Pro Racing officials and Illinois Motorcycle Dealers Association staff to send everyone home.