Many children may get a kick out of all the motorcycles. Main Street Sturgis is generally family-friendly too. But look out for:
Evening (Especially Late Night) Activities. Some parties and events can get out of hand.
Noise. Hundreds of thousands of engines thundering at the same time might be too much for young ears.
Substance Use. Expect to encounter attendees under the influence of alcohol and/or illegal drugs.
Traffic. So many people in a tiny town can turn waiting into an athletic event. Little ones can get grumpy when schedules get scrambled.