Race Judicata, a 5K in Grant Park, is scheduled for 6:30 p.m. on Sept. 10. A field of 3,400 participated last year. Are you ready?Pace yourself! It can be a big mistake to start out sprinting the first mile because even in a short 5K that can leave you struggling to finish the next two miles.Wear the right gear. If you normally train in your favorite running shoes and socks, wear those same ones on race day. You don’t want to be fumbling around with new gear on race day.Keep your meals light. Race Judicata happens to …