Columbus Day has so far been only celebrated once in the kingdom, but its content was one of the most enjoyable story arcs to date. It is not known if there will be future Columbus Day events, nor what potential content they might hold.
On Columbus Day I:
From Cristobal Colon (#1492)
Hail there, fellow Adventurer!
I am a traveller from Distant Lands, and landed on the shores of your
Kingdom just yesterday. Sadly, I've met with a cold reception thus far.
Your Kingdom seems to be overrun with brutes!
I offer you this gift as a sign of my goodwill and desire to coexist
peacefully with you and your kin. I hope that it will help warm you in the
cold Loathing nights.
Fare thee well!
You acquire an item: comfy blanket
In addition, Cristobal Colon was giving the blankets out a few hours after rollover, and put 200 of them in his store for 1 meat each (1/day limit). A few hours after that he sold them again, but this time at 100 meat each (1/day limit).
It is believed that using the comfy blanket caused your character to contract a communicable disease. This disease, known as The Gray Plague, ran rampant in the kingdom until it was finally removed via an inoculation program by The Council of Loathing.