"Fine" Percy thought Katie was being a bit of a spoilsport, but if she was going to be like this, he might as well tell her. They were only a few blocks away from the location, anyway.
"We're going dancing. But not to a nightclub. The Stardust Ballroom Studio puts on monthly dance night, and that's where we're going." Percy told her, proudly, pleased with the arrangements he made. "I hope you wore your dancing shoes!"