On Oct. 20 to 22, 5:30 p.m. to 8:30 p.m., visit DC’s favorite not-so-spooky Halloween haunt. With more than 40 treat stations, animal demonstrations, keeper chats, and decorated trails, this frightfully fun evening is a treat for the whole family. Also, don’t miss a themed hay maze and scarecrow field. $35 at the gate. All guests two and older, adults included, must have a ticket. Reserve tickets at nationalzoo.si.edu.