We saw a steady flow of traffic all through last year on a few .christmas domains from last year's advent calendars.
I don't think they seem stale, but perhaps out of season Either way, we're committed to keep this content online for the foreseeable future, and write a new edition next year if people find it interesting.
Domains expire after a year, so it you'll always be renewing around Christmas. Unless you were referring to maintaining the site itself, which yes, probably won't have any new postings around July.
Who will be more compelled to click on a Christmas link in, say, July? A christmas-themed link in February or March seems stale as hell.