@Daedolon : Good/Bad News! I have found more ways to interrupt events!
First off though a few notes:
1- The event "Lily's Plan" should have a requirement that you've brought over Rin before, as otherwise Lily is meta-gaming by knowing what Rin is.
2- "Devil Encounter" events are stack-able, and by that I mean bring a heap of girls over to Lily at the right time and you'll go through them one by one. (You just need to right-click twice and you'll go through it, and also get some visual bugs)
So, you guessed it, I brought over 4-5 girls for doll-mode-afying and the "Lily's Plan" event triggered. Then all of the girls I brought with me wanted to meet Lily and started their own "Devil's Encounter" events, meaning I missed the "Lily's Plan". Should be a simple fix by adding the same requirement that the "Lily Warning a Demon" event has ie, No girl must follow [MC].
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EDIT:
Or perhaps not. I've discovered that the event dosen't railroad you down to the church like I thought it would, well anyway, the two notes I left should be of use to you.