On one hand, NPC: Cindy Loom is a seasonal event-based character who will likely disappear once the season has ended. On the other hand, this is exactly the kind of timely information the wiki needs. Once the event has concluded, the pages can be annotated to indicate they were used during the 2013 Christmas event.
We have a similar situation with Mutation: Annie Hall. The linked page is used as a disambiguation page leading to several, distinct location-based pages for this character. I think something similar could be used in this case.