What is the fine-grained topic of the following text: While they did that, my parents and I participated in “Spies in the City.” During Spies in the City, an interactive program that takes participants around Downtown DC, my parents and I went on a “mission to save the city.” It was really fun just spending time with them walking around DC, and we saw a lot of nice sights, too. Only return the topic.
Participating in the "Spies in the City" interactive program in Downtown DC