Race Your Personal at the Rock 'n' Roll Half Marathon this fall. The best time to take advantage of your spring and summer training is in the fall when the conditions are cooler. Rock 'n' Roll features a fast and fun course with lots of great amenities before, during and after the race.Meet at Grand Army Plaza Thursdays at 7p, Sundays at 8a, starting July 31 through race day on October 8.