The 16th annual Nathan's Hope Walk-Run-Roll 5K will be at 9 a.m. Saturday at Keeneland's Barn No. 2. Registration for the event is from 8 to 9 a.m. race day. Nathan's Hope, which includes a 5K walk, run or ride around the Keene land property followed by a silent auction and raffle, is in memory of Nathan Matzuschevitz, who died at age 8 of primary pulmonary hypertension. Money raised from the event goes to the Nathan's Hope Pulmonary Hypertension Clinic at Kentucky Children's Hospital and a scholarship fund in the University of Kentucky Animal Sciences department.