"Soon," Hermione said, and that was as clear as she could be on a date. "This weekend, maybe, or next week. But that soon, or we'll miss our chance." She ignored the question about what they were planning on doing, hoping Ginny would take the hint that she couldn't answer it.
As for the Slytherins... "I don't know, Ginny. What do you think? Even Slytherins... I mean, the lower forms. No matter what house, we shouldn't have eleven year olds in the crossfire, but the chance of a sort of plan leaking out through them. You're right."