Facing uncooperative weather, Sunday's C.J. Rayburn Memorial at Circle City Raceway in Indianapolis, Ind., has been postponed, officials announced this afternoon. The $10,000-to-win Ultimate Heart of America Super Late Model paying tribute to the late Hall of Fame chassis builder has been rescheduled for Memorial Day, May 30.

Other schedule and purse changes:

• May 28 and July 9 XR Southern All Star events at Thunderhill Raceway Park in Summertown, Tenn., will pay $5,000-to-win, the series announced; the events were originally listed at $4,000-to-win.

• The Repairable Vehicles.com Tri-State Series has posted upgraded purses for two events. May 29's Ben Nothdurft Memorial at Huset's Speedway in Brandon, S.D., will pay a series-high $5,000-to-win and Sept. 13's event at Clay County Fair Speedway in Spencer, Iowa, will pay $3,000-to-win (up from $1,500).