The Hopkinton Marathon Committee is sponsoring a free 100-yard dash for children ages 5-12 on Saturday, April 13 (two days before the Boston Marathon) at 1 p.m. at the Town Common. Participants will receive a T-shirt, race bib and finisher’s medal. Advance registration is required by April 12, and the event is limited to the first 100 to register. For more information, visit hopkintonmarathoncommitteema.org.