Thursday, January 07, 2010 LAKEVILLE, Conn. – Skip Barber Racing School today announced its 2010 MAZDASPEED Challenge schedule, which features the addition of both an eighth Race Weekend and two new venues; Grattan Raceway and Mid-Ohio Sports Car Course. As part of the MAZDASPEED Motorsports Development Ladder, the MAZDASPEED Challenge champion will be invited to the annual Mazda Club Racing