5K and 10K courses for adults; 1K and Kids Run for children. The deadline for preregistration is Oct. 5; mail-in registration must be postmarked by Sept. 30. Day-of registration opens at 7 a.m. and ends 30 minutes before each race start. Registration is open to the first 2,000 racers. Registration, race information on the Three Rivers Park District website. Information provided by Three Rivers Park District