Whilst parkrun fully accepts its duty of care and will do everything it can to minimise risk of injury and harm to all participants whilst at parkrun events, it is parent/guardians who ultimately have responsibility for the welfare of their children.
It is not mandatory for a parent/guardian to participate in junior parkruns, but children under the age of 11 must be accompanied to/from the event by a responsible adult, and the responsible adult must remain in attendance for the duration of the event.