From the publish notes:
• During the month of October (October 1st – October 31st ET) Butchers can be found in Graveyards throughout Britannia.
• Butchers have a chance to drop a “Carving Kit.”
• Carving kits can be used on new carveable pumpkins to craft 9 different Jack o’ Lanterns.
• Carveable pumpkins can be found on Grimms, randomly spawning in pumpkin patches throughout Britannia.
• Some old and some new items have been added to Trick or Treating, including the heads of the UO Dev Team on a pike. GM Begging is required to have a chance at special Trick or Treat rewards, including the Heads on a Spike.