What is the fine-grained topic of the following text: ), $25 race-day entry; children in the fourth grade or younger are free (but still must be pre-registered or register the day of the race and an adult must sign a waiver); all children will get a ribbon; shirts are available to anyone for $12 extra; shirts are guaranteed to those who a) pre-register by September 7, 2019 and b) order one in advance; some shirts may be available for purchase on race day while supplies last but no guarantees! Only return the topic.
Race-day registration and related information