Summary[]
The Halloween event comes to Imperium near the end of September and usually runs through the beginning of November. You are tasked to find chocolate coins and candles. Chocolate coins can be turned into Tricksie Troublestump for items.
Obtaining Chocolate Coins[]

Hail Tricksie and click on "chocolate coins" to receive a Halloween mask. Put the mask in your head slot. Go to zones and look for floating pumpkins. Select them (they will show up without a name) and say "Trick or Treat". That will spawn a Halloween Enthusiast. Hail them and they will give you a chocolate coin. If you aren't wearing the mask you won't get coins.
Locations[]
The following locations have been found to have floating pumpkins. These were pulled from this forum thread.
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Shop[]
See the page for Tricksie Troublestump to see the items you can purchase with chocolate coins.
Obtaining Candles[]
You obtain Glowing Jack-O-Lantern Candle's by killing the Pumpking. See that page for information on what you can do with the candles.