Come to the grounds of the Physick Estate, 1048 Washington St., for the Christmas tree lighting with special guests Santa Claus and Dr. Physick. Refreshments will be served, and guests may enjoy a free self-guided tour of the Physick Estate from 6 p.m. to 8 p.m. Santa arrives at 7 p.m. to flip the switch and light the thousands of bulbs. Presented by the Mid-Atlantic Center for the Arts & Humanities (MAC).