Bolt for Babies 5K Arlington (Ballston), Va.   The third annual March of Dimes Bolt for Babies 5K will be held Saturday, August 28, and will take participants through Arlington, Va., along the Bluemont Course. Registration is required and the fee is $20 through July 31 ($25 until August 15 and $30 through race day).  Registration includes a T-shirt.  Day-of registration begins at 7:30 a.m. (if spots are available).  Proceeds from the event will benefit the March of Dimes Maryland-National Capital Area Chapter.