[Coldsaturn]

No no the Timelock Key event is the one that ran together with the release of the new main chapter Death&Rebirth. It's the one with the artful drawings related to Sylus and Zayne with cryptic text overlay detailing their story.
You collected the images (we talked about the Sylus ones!) in one thread somewhere around in the forum. If you click on the link I put in the post here with Zayne's yearly calendar, you'll recognize what I'm talking about!

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The keys you buy with the chocolate currency unlock the chapters in the Touring In Love event, which is permanently available to you in the Event list page :)