The Going Out Guide lists free things to do every day this week.

"Octopus" by Jonah Lobe

Washington National Opera

The WNO offers a sneak peek at its two new productions, performing selections from Wagner’s “The Flying Dutchman” and Poulenc’s “Dialogues of the Carmelites.”

6 p.m. Kennedy Center, Millennium Stage, 2700 F Street. NW. 202-467-4600.

“A Monstrous Reality”

Local artist, game designer and writer Jonah Lobe’s colorful digital illustrations, drawings and 3D game assets are displayed in this retrospective presented by Dance Place and maDCap. The opening reception is being held at 6 p.m. and the gallery will be open until 8 p.m.

6 p.m. Studio 21, Monroe Street Market, 716 Monroe Street. NE.

Genes in a Bottle

Ever wanted to know what your DNA looks like? In this molecular biology workshop, guests will be invited to make necklaces from their own genetic material. Children ages 7-12 must attend with an adult.

10 a.m. to 12 p.m. Natural History Museum, 10th Street and Constitution Avenue. NW. 202-633-1000.

Game of Drones

The National Building Museum, International Spy Museum and D.C. Drone User Group team up to present “Eyes in the Sky: Game of Drones,” a family day program in which local drone aficionados will give demonstrations and compete to see whose drone can successfully complete the most spy missions.

11 a.m. to 2 p.m. National Building Museum, 401 F Street. NW. 202-272-2448.

Chocolate Lovers Festival

Make it out to the last day of Fairfax’s two-day celebration of all things chocolate. Though not all of the events are free, guests can enjoy activities such as the Chocolate Caper Mock Trial (Wolf v. Pig), and a cupcake-building workshop free of charge. Check out a full list of the festival’s events here.

Noon to 4 p.m. Multiple locations in Old Town Fairfax.