People who grow up in D.C. wind up spending a lot of night time shivering in parks. Sure, they can be cold and nasty, but the city’s public spaces are easy places to hide out from parents, if not from cops. It turns out, however, that the moonlit landscape is a great place to look at things besides cans of lukewarm beer. At the National Arboretum’s “Arboretum by Moonlight” walk, botanist Kevin Conrad will show off the urban oasis’s splendid evergreens under January’s full moon. Dress warmly and revisit your wayward adolescence, minus the Milwaukee’s Best, from 8-10 p.m. at the National Arboretum, 3501 New York Ave. NE. FREE. For reservations call (202) 245-4521. (Michael Schaffer)