In Prospect Park. Registration on www.active.com, just search valentine, brooklyn or stop by Slope Sports on 7th Avenue between Lincoln and Berkeley on Friday 2/12 between 11-7 or Saturday 2/13 between 10-6 and take advantage of 20% off any non-sale items in the store, or race morning at the KofC on 10th Avenue off of Prospect Park Southwest from 9:00 AM to 9:45 AM