Looks like you get to keep them since the events just cycle through! And you can get them from acheivements as well
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Always take care when walking alone, lest you meet those monsters in the woods. They look beautiful at first (like snow), but then you see their too long faces, their all black eyes. Any you hear their garbled words, spoken in sing-song voices. Like a parody of of you. It's really such a terrible thing to know.