Registration for the 2012 Bank of America Chicago Marathon kicked off Wednesday with record demand. Currently, more than 30,000 people have registered for the 35th anniversary event. If you want to be part of the Bank of America Chicago Marathon on Sunday, October 7, register now to secure your spot in the field. Registration will close when the 45,000-participant capacity is reached. For more information on the race and to register, visit chicagomarathon.com.