sentences:  Participants may choose to register for the 5k as a timed or untimed runner.In 2005, 3,843 harriers completed the Trot, in addition to 22,668 runners in the , making the Dallas Turkey Trot the largest Thanksgiving race in the United States and the second-biggest footrace in the state of Texas, with 26,511 total registered runners.The 2011 race attracted a record attendance of 36,820.