When: 4 p.m. to 7 p.m. Saturday
What: The 10th annual Burke & Herbert Holiday Boat Parade of Lights. The harbor will sparkle when 50 powerboats and sailboats led by the Vigilant, Alexandria's fireboat, parade down the Potomac River from Washington to Alexandria decked out in lights. Santa Claus arrives at the marina by fireboat to kick off the fun at 4 p.m. Kids and dogs can have their picture taken with Santa for free. Entertainment includes a brass band and a hand bell choir.