No, please do NOT run if you have not been officially entered in the race. Race amenities along the course and at the finish, such as fluids, medical care, and traffic safety, are provided based on the number of expected official entrants. Any addition to this by way of unofficial participants, adversely affects our ability to ensure a safe race for everyone. Violators are subject to penalties and/or disqualification. Boston Marathon Registration Spectator Information Can I run in the Boston Marathon as an unofficial or "bandit" runner?