JACKSON, Minn. – Jackson Motorplex and Park Jefferson Speedway are pleased to announce the Big Buck Bonus for IMCA Modifieds this Memorial Day weekend.Both tracks will offer $1,000 to win IMCA Modified Fast Shaft All-Star Invitational ballot qualifiers this weekend. Any driver who can sweep both nights of racing will earn a Big Buck Bonus of $1,000 on top of their winnings, making their weekend haul a very nice $3,000 paycheck.Starting first on Friday night, May 26 at the famed Jackson Motorplex half-mile, the IMCA Modifieds will take to the newly-renovated oval for the Danny Williams Memorial race. Gates open at 5 p.m. with hot laps scheduled for 7:30 p.m.The following night, drivers head over to South Dakota to Park Jefferson Speedway north of Sioux City for The Clash, where the 3/8-mile oval will see drivers compete for a second $1,000 pay day. Gates open at 5 p.m. with hot laps at 6:30 p.m.Jackson Motorplex is located adjacent to the Jackson County Fairgrounds off Interstate 90 in Jackson, Minn. The track website is www.jacksonmotorplex.com.Park Jefferson Speedway is located 10 miles north of Sioux City, Iowa between Sioux City and Jefferson, S.D., off Interstate 29. The track website is www.parkjeff.com.For more information on this weekend’s racing, contact Jackson’s Doug Johnson at 605 359-4955 or Park Jefferson’s Rod Olson at 712 267-3278.