Where in Petworth are you? There are a good number of classes at Bloombars in Columbia Heights, which is quite close if you're near the Petworth metro but can be a hike if you're further north.

I am looking for some sort of structured classes for my kids in DC during the summer. They are 3.5 and 5. We have an au pair so will put them in camp for a week or two but need ideas to fill the rest of the time. All I can find are classes that are available on the weekend. Anyone have any good recommendations?