A single blast of the air horn signaled the start of the annual Seven Sisters and Two Brothers Road Race Series, with the Highway One Pictures 5K in Dewey Beach on Memorial Day. Now in its 10th season, the series of nine races attracts runners and competitive walkers from the tri-state region and beyond, promising a USATF-certified course, chip-timing and a heck of an after-party. These weekend 5K races culminate in the September Bottle & Cork Ten Miler and benefit Beebe Medical Center. To register, visit www.sevensistersdeweybeach.com.