Dug this old pic up; here is the first annual Graaloween event from the year 2000. It's amazing how beautiful this event has grown.
Some history: I originally through the party to show off the bomy-bopots (shelled creatures); Stefan, Kyle0654 & I showed up as bomies. TrueHeaT can be found coining the first use of "Graaloween"; near the waterfalls pieces of candy were available for novelty collecting.
The "nira spike tills" were setup that when you touched the one at the entrance, it would randomly equip you with an entirely different costume.
Many players can be seen showing up to the party dressed as other players.