The 5 best things to do with kids in the D.C. area this weekend

If a trip to Paris isn’t in the cards this spring, the Georgetown French Market should be on any Francophile’s calendar. This annual sidewalk sale happens on Wisconsin Avenue NW between O Street and Reservoir Road, and up and down the surrounding streets, with more than 40 local businesses participating in the fun. Browse pop-up outdoor book sales, take 10 percent off French wine at Bacchus Wine Cellar, get a grilled merguez sausage from Patisserie Poupon, and listen to live music or watch street performers, including a mime and a unicyclist. Friday and Saturday from 10 a.m. to 5 p.m., Sunday from noon to 5 p.m. Free.

Saturday is an exciting day for children of all ages: Glen Echo Park’s 103-year-old Dentzel Carousel opens for yet another season. Riders can claim their favorite animal — a galloping ostrich, bounding hare, majestic lion — while the gorgeously restored carousel spins to the waltzing tunes of a 1926 Wurlitzer band organ. Each trip is $2, making a $5 unlimited day pass a great deal. But there’s more to do than go up and down, around and around: The day’s activities include free music and dance performances, hands-on crafts, dance classes, and open art studios. (Some events in the park that day, such as performances of “Alice in Wonderland” at the Puppet Co., charge a fee.) Saturday from 11 a.m. to 4 p.m. Free admission; carousel rides $2 each or $5 for an all-day pass.

Throughout the Free State, March 25 is celebrated as Maryland Day, which commemorates the arrival of English colonists in 1634. But in College Park, Maryland Day is something else: a celebration of the state’s flagship university, when the campus opens its doors to the surrounding community, alumni or not. There are more than 400 activities taking place, from the football team’s spring game to an insect petting zoo. (“Imagine tarantulas, exotic insects, scorpions, bees and millipedes longer than your hand for you to look at and touch.”) Try making 3D art, conduct surgery with robots, listen to musical performances, explore rare books or sample ice cream from the Maryland Dairy. Saturday from 10 a.m. to 4 p.m. Free.

The National Building Museum’s “Great Movies in the Great Hall” is like bringing your favorite summer movie series indoors. Bring a blanket or lawn chairs, complete with a picnic, to spread out on the carpet in one of the city’s most impressive indoor spaces, among the soaring Corinthian columns. Before “The Lord of the Rings: The Fellowship of the Ring” screens, J.R.R. Tolkien researcher Joey Wilson-Brooke presents a virtual program about the role of architecture and design in the books and on-screen. Costumes are encouraged. Popcorn and beverages are available for purchase. (No outside alcohol is allowed.) Saturday, doors at 6:30 p.m. $5-$15; free for children younger than 12.

The STAR Fest — that stands for “Sing, Talk and Read” — is an in-person offshoot of D.C.’s Books From Birth program. Bring little ones for a day of story times, soft play activities, musical performances by children’s entertainers and an area that lets children imagine their own stories. This event is designed for children younger than 5. Saturday from 10 a.m. to 1 p.m. Free.