(Mercer, PA April 1, 2017): Due to heavy rains over the last two days, and a lingering morning shower, Mercer Raceway Park has cancelled the program scheduled for April 1. The Saturday Night Live! opening event will be held next week, April 8, with the fabulous five divisions in action. Gates will open at 4 p.m., with practice and qualifications at 6, and racing at 6:30.