What is the fine-grained topic of the following text: On race day it is your responsibility to inform race staff that you’re a “clydesdale runner” or we will assume you are an “age-group runner.” Clydesdales/Fillys are encouraged to pre-register, once you have picked up your packet, you must go to the weigh-in station. Only return the topic.
Instructions for Clydesdale/Filly runners on a race day