Here's a winter holiday "for the rest of the rest of us."
Zamenhofa Tago -- Zamenhof Day -- is the birthday of L. L. Zamenhof (b. 1859), the founder of the international auxiliary language Esperanto. Esperantists enjoy Esperanto literature and have parties.
Can't promise you that the party will be large -- and I have no idea what kind of kuko you would have; well, here's one -- but at least it's an alternative to Festivus, and no aluminum pole required.