Now in its 17th year one of the Tri-Cities’ most popular Thanksgiving Day events is expected to draw a big turnout.The Up & At ‘Em Turkey Trot will take crowds of runners and walkers through a 5km race course through downtown Johnson City Thursday morning.But organizers think this Turkey Trot could draw their biggest turnout yet.Johnson City Commissioner Jenny Brock said 3,000 people have already pre-registered, and they’re expecting another 1,000 by the end of Wednesday.