well, for having the item only available on Holidays...you could probably look in at the function that allows you to have a pet released at a certain date...maybe take a look at that code and piece it out a bit.
You could also work that out with Item classes. I was going to look into classes myself, once I work on adding a Stats feature, but I don't know anything about them right now, so can't be of much help, apologies.
Happy Holidays, at any rate :)
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