How did you get Raven's scene?
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Not sure if you can trigger the event unless you are going along Emily's quests. After the track meet and talking to Emily about your relationship you'll run into the three girls. Like I said though, not sure if this can happen without doing Emily's route since it's trigger right after a conversation with her. Later after talking to Emily about them again you'll be able to go to their appartment to get something. After that Raven will be at the mall. Not sure what time of day but simply talk to her.